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Process and device for automatic argon arc welding and narrow gap burial arc welding for circular pipe header seam

A technology of submerged arc welding and argon arc welding, which is applied in the field of automatic welding process of header box of power station boiler, can solve the problems of high labor intensity of welders, influence of welding quality, low production efficiency, etc., save auxiliary time and improve welding quality , the effect of reducing labor intensity

Active Publication Date: 2008-07-02
SHANGHAI BOILER WORKS
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Problems solved by technology

Even if submerged arc welding (SAW) is used for the circumferential seam, manual argon arc welding (TIG) and manual arc welding (SMAW) should be used first. Although this process can basically meet the welding production requirements of headers, it is difficult to operate , Welding quality is affected by human factors, poor applicability, high labor intensity of welders, low production efficiency and other issues

Method used

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  • Process and device for automatic argon arc welding and narrow gap burial arc welding for circular pipe header seam
  • Process and device for automatic argon arc welding and narrow gap burial arc welding for circular pipe header seam
  • Process and device for automatic argon arc welding and narrow gap burial arc welding for circular pipe header seam

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Embodiment

[0030] The main technical parameters of the header during welding

[0031] Applicable range of header diameter: Φ219-838mm

[0032] Scope of header wall thickness: 16-120mm Header length: scope of application: single tube:

[0033] 1-12m; total length after welding: max.25m

[0034] Header material: carbon steel, alloy steel and stainless steel

[0035] Preheating temperature before welding: ≤300℃

[0036] Groove type of header ring seam:

[0037] U-shaped bevel with narrow gap, bevel angle range: 2~5°, root R 6, blunt edge 2mm, no gap; it can also adapt to ordinary double V-shaped bevel.

[0038] Wire Diameter:

[0039] Automatic argon arc welding TIG welding wire: Φ1.0~1.2mm

[0040] Fine wire narrow gap submerged arc welding NG-SAW wire: Φ1.6~2.0mm

[0041] Ordinary submerged arc welding SAW wire: Φ3.0~4.0mm

[0042] The automatic argon arc welding + narrow gap submerged arc welding process of the header ring seam is:

[0043] 1. The preheating temperature of the h...

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Abstract

The automatic argon arc welding and narrow gas submerged arc welding process for circular pipe header seam features the first horizontal and vertical welding with immobile workpiece and using automatic cold welding TIG wire until completing over one third of circle; the subsequent welding in the other two thirds of circle with automatically rotating welding roller frame; and the performing in the identical site of the annular seam assembling and the welding. The welding apparatus for the said technological process consists of roller device and welding frame bogie, and the welding frame bogie on some tracks parallel to roller frame tracks is movable. The present invention has the advantages of automatic operation, raised welding quality, etc.

Description

technical field [0001] The invention relates to an automatic argon arc welding and narrow gap submerged arc welding process and equipment for the circular seam of the header, which can be used for welding the butt joint of the header body, and has a header body, a spherical head, a flat end cover, an elbow and The utility model relates to the welding function of circular seams such as tees, and belongs to the technical field of automatic welding technology for circular seams of power station boiler headers. Background technique [0002] In the current situation of increasingly tense domestic power supply, in order to change the tense situation of power supply and meet the needs of the continuous development of industrial production and the needs of people's lives, many domestic provinces and cities have successively expanded and built many power plants. The demand for boilers continues to increase. With the development of power plant boilers in the direction of large capacit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/16B23K9/18
Inventor 王炯祥杨智问
Owner SHANGHAI BOILER WORKS
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