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Arc preheating method for automatic butt welding of T91 pipes

A technology of automatic welding and automatic welding machine, which is applied in the direction of arc welding equipment, electrode characteristics, welding equipment, etc.

Inactive Publication Date: 2005-12-28
WUHAN BOILER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 6. Heating can only be carried out after the pipe is assembled and positioned

Method used

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  • Arc preheating method for automatic butt welding of T91 pipes
  • Arc preheating method for automatic butt welding of T91 pipes

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Experimental program
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Effect test

Embodiment Construction

[0012] Embodiment of the present invention is provided below in conjunction with accompanying drawing, is used for further illustrating the present invention, does not mean that this invention is just limited to following:

[0013] In the picture: 1 - automatic welding machine power chuck

[0014] 2 - pipe

[0015] 3——Welding torch tungsten electrode

[0016] 4 - arc

[0017] 5——Welding power supply

[0018] 6——shielding gas

[0019] The pipe 2 is clamped and positioned on the power chuck 1 of the automatic welding machine, the start button is activated, the tungsten electrode 3 of the welding torch is quickly lowered to the top of the butt weld of the pipe 2, the shielding gas 6 is turned on, the welding power supply 5 is turned on, and the arc 4 is ignited. The power chuck 1 of the automatic welding machine starts to rotate the pipe 2, and the tungsten electrode 3 of the welding torch swings left and right. When the set heating temperature is reached, the current decays,...

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Abstract

An arc preheating method for automatic welding T91 tubes used in boiler features that the electric arc is generated between the W electrode of welding gun and tube to preheat the tube while the tube is rotating. Its advantages are controllable temp, high temp uniformity and high weld quality and productivity.

Description

technical field [0001] The invention relates to an arc preheating method for automatic butt joint welding of pipes, which is particularly suitable for automatic welding of pipes made of T91 and other materials that require preheating before welding in the boiler manufacturing industry. Background technique [0002] In the boiler manufacturing industry, there are a large number of pipes that need to be welded by automatic welding. Due to the national standards and welding procedure regulations, it is stipulated that the pipes made of T91 and other materials need to be preheated at 150-250°C before welding. At present, no matter domestic or imported The automatic welding machine does not have the function of pre-welding preheating, and needs to be preheated with oxygen and acetylene flames. The disadvantage is that there must be oxygen and acetylene gas cylinders or gas supply pipelines at the operation site, and open flame heating is used, which brings safety hazards to automa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/12B23K9/167B23K9/24
Inventor 任卓阳张鄂婴江国春张水星
Owner WUHAN BOILER
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