Protective gas for welding stainless steel

A technology of shielding gas and stainless steel, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problem of small penetration depth, increase penetration depth, widen the cross-sectional area of ​​weld seam, and improve the wetting degree of welding beads Effect

Active Publication Date: 2012-11-14
SHANGHAI YANJIE MECHANICAL ENG CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a stainless steel welding method for the existing stainless steel welding, especially argon tungsten arc welding, which uses 99.99% argon as the shielding gas for bottom welding. with shielding gas

Method used

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  • Protective gas for welding stainless steel
  • Protective gas for welding stainless steel
  • Protective gas for welding stainless steel

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0018] The shielding gas for stainless steel welding of the present invention is formed by mixing argon and hydrogen. The weight percentage of argon is 95%, and the weight percentage of hydrogen is 5%. In view of the particularity of argon-hydrogen mixed gas, hydrogen is a highly flammable gas. When the mixed gas of hydrogen and oxygen or air comes into contact with flame or other fire sources in a limited area, it will explode. Therefore, it is necessary to select the welding environment. Avoid use in closed environments.

[0019] The following is the situation of the test panel and the finished welding product:

[0020] 1. Use 95% Ar and 5% H welding shielding gas to carry out butt welds of stainless steel plates with a thickness of 6 mm. The groove form is V-shaped, the chamfer is 70, the blunt edge is 2mm, and the gap is 0-1mm. see fig...

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Abstract

The invention discloses a protective gas for welding stainless steel. The protective gas is characterized by being formed by mixing argon and hydrogen, wherein the weight percentage of argon is 95%, and the weight percentage of hydrogen is 5%. The protective gas can be applied to welding the stainless steel, can improve the thermal input of a weld joint, accelerates the welding speed, increases the depth of fusion, improves the wetting degree of a weld bead and widens the sectional area of the weld joint. After hydrogen is added into the argon, the reducing atmosphere is provided for a welding area, so that oxygen and oxide in the weld joint can be removed.

Description

technical field [0001] The invention relates to a protective gas for stainless steel welding. Background technique [0002] Generally, 99.99% argon is used as the shielding gas when welding stainless steel, especially argon tungsten arc welding for bottom welding. But it has a disadvantage that the penetration is not great. [0003] At present, the shielding gas for stainless steel welding is as follows: [0004] The duplex stainless steel welding process disclosed in Chinese Patent Publication No. CN1583347 uses a mixed gas of carbon dioxide and nitrogen as shielding gas, which has the advantages of reducing welding spatter and beautiful weld formation. [0005] The duplex stainless steel welding method disclosed in Chinese Patent Publication No. CN102019485A uses a mixed gas of carbon dioxide and nitrogen as shielding gas, which has the advantages of reducing welding spatter and beautiful weld formation. [0006] Chinese Patent Publication No. CN102416522A discloses a w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/167
Inventor 唐旭峰
Owner SHANGHAI YANJIE MECHANICAL ENG CO LTD
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