Protection method of high nitrogen austenitic stainless steel welded joint

A high-nitrogen austenitic and welded joint technology, which is applied in welding equipment, laser welding equipment, metal processing equipment, etc., can solve the problems of joint performance degradation and achieve the effect of improving weldability and ensuring mechanical properties

Inactive Publication Date: 2016-06-15
INNER MONGOLIA FIRST MACHINERY GRP
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Problems solved by technology

[0003] The invention solves the problem that a large number of dense nitrogen pores are generated during welding in the current welding method by improving the conventional high-nitrogen austenitic stainless steel laser arc hybrid welding process, which causes the joint performance to decline

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  • Protection method of high nitrogen austenitic stainless steel welded joint

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Embodiment

[0011] Such as figure 1 As shown, outside the composite laser arc welding head 4, a protective gas exhaust device 3 is added coaxially with the laser beam 2 and welding torch 1, and the protective gas exhaust device 3 is fed with pure argon, and the electromagnetic valve reserved for the laser arc composite welding system connection to realize welding synchronous control, that is, add argon to the original argon-carbon dioxide mixed gas shielding gas for gas protection. produce.

[0012] The following is the 8mm high nitrogen steel laser arc hybrid welding process:

[0013] The welding method is high-energy beam laser-arc compound heat source welding, the thickness of the welding base metal is 8mm, the Y-shaped groove, the blunt edge height is 4mm, the root gap is 0.5mm, the groove angle is 30°, the arc is in front and the laser is in the back. , The light filament distance is 3mm. The filling welding material is HCr20Ni10Mn7Mo welding wire with a diameter of 1.2mm; the arc...

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Abstract

The invention relates to a high-nitrogen austenitic stainless steel welded joint protection method, which solves the problem that a large number of dense nitrogen pores are generated during welding in the current welding method, resulting in a decrease in joint performance. When high-energy beam laser arc hybrid welding is used, pure argon is added to the original argon-carbon dioxide mixed gas shielding gas for gas protection, and the argon-carbon dioxide mixed gas and pure argon are simultaneously passed into the welding pool during welding inside. During welding, the flow rate of pure argon is 40L / Min. The invention can effectively prevent the welding protection process of a large number of pores in the weld seam during the welding of high-nitrogen austenitic stainless steel, and improve the weldability of the high-nitrogen austenitic stainless steel while ensuring the mechanical properties of the welded joint.

Description

technical field [0001] The invention relates to a welding protection method, in particular to a joint protection method for high-nitrogen austenitic stainless steel laser arc hybrid welding. Background technique [0002] As a resource-saving stainless steel, the research and application of high-nitrogen austenitic stainless steel are constantly being researched and promoted. During the welding of high-nitrogen austenitic stainless steel, the joints are prone to porosity, especially when high-energy beam laser arc hybrid welding is used. Due to the extremely fast welding speed and cooling speed, the nitrogen in the weld has no time to overflow, and it is easy to form on the surface of the weld and A large number of dense nitrogen pores are generated inside, resulting in the decline of joint performance and poor appearance quality, which seriously restricts the application of new technologies. Contents of the invention [0003] The invention solves the problem that a large ...

Claims

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Application Information

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IPC IPC(8): B23K26/12B23K26/348
CPCB23K26/12B23K26/348
Inventor 杜劭峰赵文军王宇琪杨炙坤邝玉林王小龙
Owner INNER MONGOLIA FIRST MACHINERY GRP
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