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【中文】一种炉管局部高温锻造焊接方法
【EN】A kind of boiler tube localized hyperthermia forging welding method

申请(专利)号:CN201811346706.8国省代码:山东 37
申请(专利权)人:【中文】烟台慕迪工业技术有限公司【EN】Yantai Mudi Industrial Technology Co., Ltd.
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摘要:
【中文】一种炉管局部高温锻造焊接方法,包括步骤:1)炉管切割,对炉管的焊接部位进行切除,使切除位置形成待焊接的端头;2)端头打磨,通过角磨机采用1~2mm的角磨片对待焊接的端头部位进行打磨;3)加热处理,使用热源对打磨后的端头部位进行加热,控制焊接部位的温度为570℃~630℃;4)敲击锻造,撤掉热源后立即采用锻造装置,对加热后的焊接部位进行敲击锻造;5)端头焊接,对锻造后的焊接部位进行对称焊接。本发明使旧炉管金属表面析出碳化物的粗大晶粒发生扭曲变形,在一定深度范围内变得更加密实,从而产生较大的抗拉强度,使金属能够有效地吸收和化解在焊接过程中产生的收缩应力,提高金属的抗裂性,增强了炉管的可焊性。
【EN】Paragraph:A kind of boiler tube localized hyperthermia forging welding method makes excision position form end to be welded comprising steps of 1) boiler tube cutting, cuts off the welding position of boiler tube;2) end is polished, and is polished using the angle grinding of 1~2mm end position to be welded by angle grinder;3) heat, the end position after polishing is heated using heat source, the temperature for controlling welding position is 570 DEG C~630 DEG C;4) forging is tapped, forging apparatus is used immediately after removing heat source, percussion forging is carried out to the welding position after heating;5) end is welded, and is symmetrically welded to the welding position after forging.The present invention makes the coarse grain of old boiler tube metal surface carbide precipitate be distorted deformation, become within the scope of certain depth more closely knit, to generate biggish tensile strength, metal is set to effectively absorb and dissolve the shrinkage stress generated in the welding process, the crack resistance for improving metal, enhances the solderability of boiler tube.

主权项:
【中文】1.一种炉管局部高温锻造焊接方法,其特征在于:所述焊接方法包括以下步骤: 1)炉管切割,对炉管的焊接部位进行切除,使切除位置形成待焊接的端头; 2)端头打磨,通过角磨机采用1~2mm的角磨片对待焊接的端头部位进行打磨; 3)加热处理,使用热源对打磨后的端头部位进行加热,控制焊接部位的温度为570℃~630℃; 4)敲击锻造,撤掉热源后立即采用锻造装置,对加热后的焊接部位进行敲击锻造; 5)端头焊接,对锻造后的焊接部位进行焊接。【EN】1. welding method is forged by a kind of boiler tube localized hyperthermia, it is characterised in that: the welding method the following steps are included: 1) boiler tube is cut, and is cut off to the welding position of boiler tube, and excision position is made to form end to be welded; 2) end is polished, and is polished using the angle grinding of 1~2mm end position to be welded by angle grinder; 3) heat, the end position after polishing is heated using heat source, control welding position temperature be 570 DEG C~ 630℃; 4) forging is tapped, forging apparatus is used immediately after removing heat source, percussion forging is carried out to the welding position after heating; 5) end is welded, and is welded to the welding position after forging.


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说明书

【中文】

一种炉管局部高温锻造焊接方法

技术领域

本发明涉及一种炉管局部高温锻造焊接方法,属于焊接技术领域。

背景技术

目前,高温合金材料在使用过程中一个最显著的特点是:随着温度的升高直至到达工作温度830℃-890℃并且长期使用,在这个温度区间材料中的碳化物从最初工作的10小时-1000小时即完成沿金属晶界的偏析,使用时间越长碳化物的析出从最初的小块向连贯性大块碳化物转变,正是由于碳化物的析出才是研究这种材料的最终目的,碳化物的析出使得材料在耐高温过程中更加稳定。

随着材料的服役过程的增加,碳化物不断析出,材料的可焊性变得越来越差,主要是因为材料的金属晶界聚集了大量的碳化物,抗拉强度变得很差,只要材料在受到焊接收缩应力或其他拉应力的作用下极易沿晶界开裂,另外材料本身的热导性差造成了材料的膨胀系数大导热系数小的特性,更导致了材料的裂纹倾向。参见图1,新材料的可焊接性是非常良好的,只是炉管材料随着服役时间的增加,而炉管金属表面的析出物会逐步增加,其与新炉管焊接时靠近旧炉管的一侧就会出现在热影响区沿晶界开裂。

参见图2,使用一段时间后的炉管表面的组织晶粒由于碳化物的析出变得异常粗大,导致抗拉强度等的机械性能下降,这就是新旧炉管焊接过程中遇到的开裂的主要原因。传统的焊接方法把切掉的炉管的端头用氩弧焊的电弧对坡口用100A-120A的电流、不加填充金属进行熔化后重新结晶,冷却至室温后再进行PT检验,检测的结果可以说明金属的可焊性,如果检测结果为一级或者极少量的长度不超过1mm的裂纹,说明金属的可焊性较好,如果裂纹较严重,这就说明金属的可焊性非常差。当整个坡口在氩弧焊的电弧高温下会发生燃烧或者产生喷雾状的飞溅时,金属已经不具备可焊接性。

发明内容

本发明针对现有技术存在的不足,提供一种炉管局部高温锻造焊接方法, 使金属炉管能够有效地吸收和化解在焊接过程中产生的收缩应力,提高金属炉管的抗裂性。

本发明解决上述技术问题的技术方案如下:一种炉管局部高温锻造焊接方法,所述焊接方法包括以下步骤:

1)炉管切割,对炉管的焊接部位进行切除,使切除位置形成待焊接的端头;

2)端头打磨,通过角磨机采用1~2mm的角磨片对待焊接的端头部位进行打磨;

3)加热处理,使用热源对打磨后的端头部位进行加热,控制焊接部位的温度为570℃~630℃;

4)敲击锻造,撤掉热源后立即采用锻造装置,对加热后的焊接部位进行敲击锻造;

5)端头焊接,对锻造后的焊接部位进行焊接。

作为一种炉管局部高温锻造焊接方法的优选方案,所述步骤3)中,所述热源采用炔、氧焰或者电阻加热带。

作为一种炉管局部高温锻造焊接方法的优选方案,所述步骤4)中,所述锻造装置采用手锤或者风镐头,手锤或者风镐头上包裹有奥氏体合金。

作为一种炉管局部高温锻造焊接方法的优选方案,所述步骤4)中,采用锻造装置将待焊接部位的坡口周围50~70mm范围内进行均匀的锻造。

作为一种炉管局部高温锻造焊接方法的优选方案,所述步骤4)中,焊接部位的锻造深度为3~5mm。

作为一种炉管局部高温锻造焊接方法的优选方案,所述步骤5)中还包括,对锻造后的待焊接部位进行PT检验,对检测出的焊接部位坡口裂纹进行清理。

作为一种炉管局部高温锻造焊接方法的优选方案,所述步骤5)中还包括,对炉管内95-105mm处采用粘贴纸张的方式封堵,并进行局部充氩背衬保护。

作为一种炉管局部高温锻造焊接方法的优选方案,所述步骤5)中还包括,将待焊接的端头进行区域均分,并对均分后的端头采用对称的方式进行焊接,焊接息弧后对焊道进行敲击。

本发明的有益效果是:通过炉管切割、端头打磨、加热处理、敲击锻造和端头焊接等工序,使用热源对打磨后的端头部位进行加热,控制焊接部位的温度为570℃~630℃,使旧炉管金属表面析出碳化物的粗大晶粒发生扭曲变形,在一定深度范围内变得更加密实,从而产生较大的抗拉强度,使金属能够有效地吸收和化解在焊接过程中产生的收缩应力,提高金属的抗裂性,增强了炉管的可焊性。

附图说明

图1为背景技术中述及的新炉管材料的金相图;

图2为背景技术中述及的使用后的炉管材料金相图;

图3为本发明实施例的炉管局部高温锻造焊接方法流程图;

图4为采用本发明实施例的技术方案处理前的炉管金相图;

图5为采用本发明实施例的技术方案处理后的炉管金相图;

图6为本发明实施例采用对称的方式进行焊接示意图。

具体实施方式

为使本发明的上述目的、特征和优点能够更加明显易懂,下面结合附图对本发明的具体实施方式做详细的说明。在下面的描述中阐述了很多具体细节以便于充分理解本发明。但是本发明能够以很多不同于在此描述的其它方式来实施,本领域技术人员可以在不违背本发明内涵的情况下做类似改进,因此本发明不受下面公开的具体实施例的限制。

除非另有定义,本文所使用的所有的技术和科学术语与属于本发明的技术领域的技术人员通常理解的含义相同。本文中在本发明的说明书中所使用的术语只是为了描述具体的实施方式的目的,不是旨在于限制本发明。本文所使用的术语“和/或”包括一个或多个相关的所列项目的任意的和所有的组合。

参见图3、图4和图5,本实施例提供的一种炉管局部高温锻造焊接方法,焊接方法包括以下步骤:

S1:炉管切割,对炉管的焊接部位,使切除位置形成待焊接的端头;

S2:端头打磨,通过角磨机采用1~2mm的角磨片对待焊接的端头部位进行打磨;

S3:加热处理,使用热源对打磨后的端头部位进行加热,控制焊接部位的温度为570℃~630℃;

S4:敲击锻造,撤掉热源后立即采用锻造装置,对加热后的焊接部位进行敲击锻造;

S5:端头焊接,对锻造后的焊接部位进行焊接。

本方法的一个实施例中,焊接采用氩弧焊接,焊前主要准备工具有:角磨机;1-1.2mm切片;1.5-2磅尖圆顶抛锤,小圆顶的半径应为3mm左右(或用气动小风镐);氩弧焊机一台套,此焊机为带衰减的专业氩弧焊机;氩气表、氩气带若干。焊前进行一次PT检验,若发现有问题,先把端头坡口的小裂纹处理干净在进行焊接。焊接前把背衬气体充分考虑好,因为整个炉管系统较大,不可能整个系统充入氩气进行焊接,因此最好的方法是在炉管内100mm左右粘贴容易碳化的纸张来进行封堵,局部充氩背衬保护。

本实施例涉及的PT检验,具体的,氩弧焊重熔后的PT检验是一个评定炉管可焊接性的重要指标。其方法为:把切掉的炉管的端头用氩弧焊的电弧对坡口用100A-120A的电流、不加填充金属进行熔化后重新结晶,冷却至室温后再进行PT检验,检测的结果可以说明金属的可焊性,如果检测结果为一级或者极少量的长度不超过1mm的裂纹,说明金属的可焊性较好,如果裂纹较严重,这就说明金属的可焊性非常差。当整个坡口在氩弧焊的电弧高温下会发生燃烧或者产生喷雾状的飞溅时,金属已经不具备可焊接性。

待焊接炉管的成分如下表:

成分

C

Si

Mn

P

S

Mo

0.35-0.45

1.00-2.00

1.00-2.00

≤0.30

≤0.30

≤0.50

成分

Cr

Ni

Nb

24.0-28.0

33.0-37.0

0.80-1.50

具体的,炉管切除后的打磨,打磨采用角磨机进行打磨,但是角磨片要用1-1.2mm的切片进行,防止局部打磨的温度过高。因为旧炉管在打磨过程中由于局部温度过高会产生裂纹,这类裂纹也是由于晶界的碳化物析出后,受热不均匀产生的晶界开裂。采用加热法进行锻造。使用炔、氧焰或者电阻加热带进行加热,由于火焰加热不能对整个坡口均匀加热,因此是局部高温锻造,敲击加压过程一般采用抛锤或气动小风镐,在锻造前要把手锤或者风镐头加上一层奥氏体合金在进行锻造。加热温度一般在570℃-630℃范围,加热后,撤掉火焰快速用手锤或者小风镐对加热处经行敲击锻造,直至把坡口周围50-70mm范围内均匀的锻造完成,锻造的深度一般在3-5mm,此过程结束。

参见图6,将待焊接的端头进行区域均分,并对均分后的端头采用对称的方式进行焊接。通过组对和点焊,焊缝间隙根据焊丝直径来定,一般为焊丝直径的φ+1-1.5mm,点焊的位置一般为(1.2.3点),在第4点开始焊接。采用对称焊接,先焊接a区,再焊接b区,然后焊接c区,最后焊接d区。多层多道焊接以此类推。

采用本实施例的方法,在焊接时,还要注意,因为服役的旧炉管的强度已经有了变化,因此要求再选焊接材料时一般要选镍基焊材。焊接时需要采用较特殊的焊接工艺:对称焊、小规范、收弧点要多加焊丝使其凸起、息弧后要对焊道进行敲击等。具体的,打底层结束后,在焊接填充层时要先在贴着旧炉管一侧进行焊接,最后焊接与新炉管一侧。每次焊接80-100mm后停弧,立即用抛锤或小型气动风镐进行敲击锻造消除应力,减少裂纹倾向。

焊接后可采用射线探伤(RT)Ⅱ以上合格,渗透探伤(PT)Ⅰ级合格。最后进行气密检验,试验压力可按照设计压力进行,或者是工作压力的 1.2-1.5倍。

对某石化制氢转化炉下集合管的焊接以及下集合管的加强接头的焊接,采用本实施例局部高温锻造法,设备稳定运行时间显著增加。

以上所述实施例的各技术特征可以进行任意的组合,为使描述简洁,未对上述实施例中的各个技术特征所有可能的组合都进行描述,然而,只要这些技术特征的组合不存在矛盾,都应当认为是本说明书记载的范围。

以上所述实施例仅表达了本发明的几种实施方式,其描述较为具体和详细,但并不能因此而理解为对发明专利范围的限制。应当指出的是,对于本领域的普通技术人员来说,在不脱离本发明构思的前提下,还可以做出若干变形和改进,这些都属于本发明的保护范围。因此,本发明专利的保护范围应以所附权利要求为准。

【EN】

A kind of boiler tube localized hyperthermia forging welding method

Technical field

The present invention relates to a kind of boiler tube localized hyperthermias to forge welding method, belongs to welding technology field.

Background technique

Currently, a most significant feature is high-temperature alloy material in use: as the temperature rises until arriving

It up to 830 DEG C -890 DEG C of operating temperature and is used for a long time, the carbide in this temperature range material is from the 10 of virgin work

- 1000 hours hours completed the segregation along metallic grain boundaries, using the precipitation of time longer carbide from initial fritter to even

Coherence bulk Carbides Transformation, the precipitation just because of carbide are only and study the final purpose of this material, the analysis of carbide

Out so that material is more stable during high temperature resistant.

With the increase of the military service process of material, carbide is constantly precipitated, and the solderability of material becomes worse and worse, mainly

It is because the metallic grain boundaries of material have accumulated a large amount of carbide, tensile strength becomes very poor, as long as material is received by welding

Easily along grain boundary separation under the action of stress under compression or other tensile stresses, in addition the thermal conductance difference of material itself causes the swollen of material

The small characteristic of the swollen big thermal coefficient of coefficient, more results in the crackle tendency of material.Referring to Fig. 1, the weldability right and wrong of new material

Often good, only furnace tube material is with the increase of active time, and the precipitate of boiler tube metal surface can be stepped up, with

Heat affected area is just appeared in along grain boundary separation close to the side of old boiler tube when new welding of tubes.

Referring to fig. 2, the tissue crystal grain of tube skin after a period of use is thick since the precipitation of carbide becomes exception

Greatly, the mechanical performance of tensile strength etc. is caused to decline, the main reason for here it is the crackings encountered during new and old welding of tubes.

Traditional welding method is the electric arc of the end argon arc welding of the boiler tube cut away to the groove electric current of 100A-120A, be not filled with

It fills after metal is melted and recrystallizes, carry out PT inspection after being cooled to room temperature again, what the result of detection can illustrate metal can

Weldering property illustrates that the solderability of metal is preferable if testing result is level-one or the crackle of minimal amount of of length no more than 1mm,

If crackle is more serious, this just illustrates that the solderability of metal is excessively poor.When entire groove can be sent out under the high arc temperature of argon arc welding

When raw burning or the splashing of generation spray form, metal does not have weldability.

Summary of the invention

The present invention makes metal in view of the deficienciess of the prior art, provide a kind of boiler tube localized hyperthermia forging welding method

Boiler tube can effectively absorb and dissolve the shrinkage stress generated in the welding process, improve the crack resistance of metal boiler tube.

The technical scheme to solve the above technical problems is that welding method, institute are forged by a kind of boiler tube localized hyperthermia

State welding method the following steps are included:

1) boiler tube is cut, and is cut off to the welding position of boiler tube, and excision position is made to form end to be welded;

2) end is polished, and is polished using the angle grinding of 1~2mm end position to be welded by angle grinder;

3) heat, the end position after polishing is heated using heat source, the temperature for controlling welding position is 570

DEG C~630 DEG C;

4) forging is tapped, forging apparatus is used immediately after removing heat source, percussion forging is carried out to the welding position after heating;

5) end is welded, and is welded to the welding position after forging.

As a kind of preferred embodiment of boiler tube localized hyperthermia forging welding method, in the step 3), the heat source is used

Alkynes, oxygen flame or resistance heating band.

As a kind of preferred embodiment of boiler tube localized hyperthermia forging welding method, in the step 4), the forging apparatus

Using being enclosed with austenitic alloy on hand hammer perhaps pneumatic pick head hand hammer or pneumatic pick head.

As a kind of preferred embodiment of boiler tube localized hyperthermia forging welding method, in the step 4), using forging apparatus

It will uniformly be forged within the scope of 50~70mm around the groove of position to be welded.

As a kind of preferred embodiment of boiler tube localized hyperthermia forging welding method, in the step 4), the forging of welding position

Making depth is 3~5mm.

As a kind of preferred embodiment of boiler tube localized hyperthermia forging welding method, further include in the step 5), to forging

Position to be welded afterwards carries out PT inspection, clears up the welding position groove crackle detected.

As a kind of preferred embodiment of boiler tube localized hyperthermia forging welding method, further include in the step 5), to boiler tube

It is blocked by the way of pasting paper at interior 95-105mm, and carries out local argon filling backing protection.

As a kind of preferred embodiment of boiler tube localized hyperthermia forging welding method, further include in the step 5), it will be to be welded

The end connect carries out region and divides equally, and is welded to the end after dividing equally using symmetrical mode, to welding bead after welding breath arc

It is tapped.

The beneficial effects of the present invention are: being welded by boiler tube cutting, end polishing, heat treatment, percussion forging and end

Etc. processes, the end position after polishing is heated using heat source, control welding position temperature be 570 DEG C~630 DEG C, make

The coarse grain of old boiler tube metal surface carbide precipitate is distorted deformation, becomes more closely knit within the scope of certain depth,

To generate biggish tensile strength, metal is enable to effectively absorb and dissolve the shrinkage stress generated in the welding process,

The crack resistance for improving metal, enhances the solderability of boiler tube.

Detailed description of the invention

Fig. 1 is the metallographic microscope for the new furnace tube material addressed in background technique;

Fig. 2 is the furnace tube material metallographic microscope after the use addressed in background technique;

Fig. 3 is that welding method flow chart forges in the boiler tube localized hyperthermia of the embodiment of the present invention;

Fig. 4 is the boiler tube metallographic microscope before the technical solution processing using the embodiment of the present invention;

Fig. 5 is technical solution treated the boiler tube metallographic microscope using the embodiment of the present invention;

Fig. 6 is that the embodiment of the present invention uses symmetrical mode to carry out welding schematic diagram.

Specific embodiment

In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing to the present invention

Specific embodiment be described in detail.Many details are explained in the following description in order to fully understand this hair

It is bright.But the invention can be embodied in many other ways as described herein, those skilled in the art can be not

Similar improvement is done in the case where violating intension of the present invention, therefore the present invention is not limited by the specific embodiments disclosed below.

Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention

The normally understood meaning of technical staff is identical.Term as used herein in the specification of the present invention is intended merely to description tool

The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term as used herein "and/or" includes one or more

Any and all combinations of relevant listed item.

Referring to Fig. 3, Fig. 4 and Fig. 5, a kind of boiler tube localized hyperthermia forging welding method provided in this embodiment, welding method

The following steps are included:

S1: boiler tube cutting makes excision position form end to be welded the welding position of boiler tube;

S2: end polishing polishes to end position to be welded using the angle grinding of 1~2mm by angle grinder;

S3: heat treatment heats the end position after polishing using heat source, the temperature for controlling welding position is

570 DEG C~630 DEG C;

S4: tapping forging, uses forging apparatus immediately after removing heat source, carries out percussion forging to the welding position after heating

It makes;

S5: the welding position after forging is welded in end welding.

In one embodiment of this method, welding uses argon arc welding, is primarily intended for work before weldering and includes angle grinder;1-

1.2mm slice;1.5-2 pounds of sharp domes throw hammer, and the radius of small dome should be 3mm or so (or with pneumatically small pneumatic pick);Argon arc welding machine

One set, this welding machine are the professional argon arc welding machine with decaying;Argon gas table, argon gas band are several.It carries out a PT before weldering to examine, if hair

Existing issue is first completely welding the crackle processing of end groove.Backing gas is fully considered before welding, because

It is larger for entire furnace duct system, it is impossible to which that whole system is filled with argon gas and is welded, therefore the best way is in boiler tube

100mm or so pastes the paper of easy carbonization to be blocked, and local argon filling backing is protected.

The PT that the present embodiment is related to is examined, specifically, the PT inspection after argon arc welding remelting is that an evaluation boiler tube is solderable

The important indicator of property.Its method are as follows: the electric arc of the end argon arc welding of the boiler tube cut away to the electricity of groove 100A-120A

Flow, be not added filling metal melted after recrystallize, PT inspection is carried out after being cooled to room temperature again, the result of detection can illustrate

The solderability of metal illustrates the solderable of metal if testing result is level-one or the crackle of minimal amount of of length no more than 1mm

Property is preferable, if crackle is more serious, this just illustrates that the solderability of metal is excessively poor.When entire groove is in the high arc temperature of argon arc welding

When the lower splashing that burning can occur or generate spray form, metal does not have weldability.

The ingredient of boiler tube to be welded is as follows:

Ingredient

C

Si

Mn

P

S

Mo

%

0.35-0.45

1.00-2.00

1.00-2.00

≤0.30

≤0.30

≤0.50

Ingredient

Cr

Ni

Nb

%

24.0-28.0

33.0-37.0

0.80-1.50

Specifically, the polishing after boiler tube excision, polishing are polished using angle grinder, but 1-1.2mm is used in angle grinding

Slice carry out, prevent the temperature of detail sanding excessively high.Because old boiler tube can be produced since local temperature is excessively high during the grinding process

Raw crackle, after this kind of crackle is also due to the Carbide Precipitation of crystal boundary, the grain boundary separation of the even generation of uneven heating.Using heating

It is forged.It is heated using alkynes, oxygen flame or resistance heating band, since flame heating cannot uniformly add entire groove

Heat, therefore be localized hyperthermia's forging, taps pressure process generally using throwing hammer or pneumatic small pneumatic pick, before forging hand hammer or

Person's pneumatic pick head is being forged plus one layer of austenitic alloy.Heating temperature generally in 570 DEG C of -630 DEG C of ranges, after heating, is removed

Fall flame and quickly tap forging through row at heating with hand hammer or small pneumatic pick, until equal within the scope of 50-70mm around groove

Even forging is completed, and generally in 3-5mm, this process terminates the depth of forging.

Referring to Fig. 6, end to be welded is subjected to region and is divided equally, and the end after dividing equally is carried out using symmetrical mode

Welding.By group to and spot welding, weld gap determined according to gage of wire, the generally φ+1-1.5mm of gage of wire, spot welding

Position be generally (1.2.3 point), start to weld at the 4th point.Using being symmetrically welded, the area a is first welded, then weld the area b, then welded

The area c is met, the area d is finally welded.Multi-layer multi-pass welding and so on.

Using the method for the present embodiment, in welding, it is also noted that because the intensity for the old boiler tube being on active service has had change

Change, therefore it is required that Ni-based wlding will generally be selected again by selecting when welding material.It needs to use more special welding procedure when welding: symmetrical

Weldering, it is small specification, receive acnode to add welding wire make its protrusion, breath arc after welding bead is tapped etc..Specifically, prime coat terminates

Afterwards, it first to be welded against old boiler tube side when welding filled layer, finally welding and new boiler tube side.Welding every time

Stop arc after 80-100mm, is carried out tapping forging elimination stress, reduction crackle tendency immediately with throwing hammer or miniature pneumatic pneumatic pick.

It is qualified that radiographic inspection (RT) II or more can be used after welding, I grade of qualification of penetrant inspection (PT).Finally carry out airtight inspection

It tests, test pressure can carry out or 1.2-1.5 times of operating pressure according to design pressure.

The welding of the reinforced joint of welding and lower concetrated pipe to concetrated pipe under certain petrochemical industry hydrogen manufacturing conversion furnace, using this reality

Shi Li localized hyperthermia forging method, equipment parallel-adder settle-out time dramatically increase.

Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality

It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited

In contradiction, all should be considered as described in this specification.

The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously

It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art

It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention

Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.

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