Method for removing laser welding pores of medium-thick D406A ultra-high-strength steel

A technology of laser welding and ultra-high strength steel, used in laser welding equipment, welding equipment, metal processing equipment, etc.
CN105328342AInactive Publication Date: 2016-02-17HARBIN INST OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
HARBIN INST OF TECH
Publication Date
2016-02-17
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a method for removing laser welding pores of a medium-thick D406A ultra-high-strength steel, and aims at solving the problem of pores of a medium-thick D406A ultra-high-strength steel plate in welding. The method comprises the following steps: grinding and cleaning a part to be welded; assembling; setting backing weld and filling weld process parameters; controlling the welding process parameters through a robot integration system; arcing through TIG (Tungsten Inert Gas Welding) electric arc; stabilizing the electric arc for 1 to 2 seconds; controlling a laser to emit laser; finally controlling a robot to drive a laser working head and a TIG welding gun to work together to finish the welding process. According to the method, different pore inhibiting measures are carried out for backing weld and filling weld.
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Description

technical field

[0001] The invention relates to a method for eliminating pores in laser welding of medium-thick D406A ultra-high-strength steel, belonging to the field of material processing engineering. Background technique

[0002] With the development of the aviation industry, ordinary structural steel can no longer meet the needs of important components, and ultra-high-strength steel has emerged as the times require. It has high tensile strength and good toughness, and is widely used in aerospace and weapon fields. Ultra-high-strength steel 30Si2MnCrMoVE (D406A for short) is a self-developed steel grade in my country. The tensile strength is higher than 1620MPa and the elongation is higher than 8%. It is mainly used for solid rocket motor casings. At present, the common methods of welding D406A steel are TIG welding and electron beam welding. The cost of TIG welding is lower, but the penetration depth of TIG welding is shallow and requires more welding layers, which not...

Claims

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