Method for removing laser welding pores of medium-thick D406A ultra-high-strength steel
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A technology of laser welding and ultra-high strength steel, used in laser welding equipment, welding equipment, metal processing equipment, etc.
Inactive Publication Date: 2016-02-17
HARBIN INST OF TECH
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[0004] The present invention aims to solve the problem of porosity in welding medium-thick D406A ultra-high-strength stee
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specific Embodiment approach 1
[0025] Specific implementation mode one: a kind of method of eliminating medium-thickness D406A ultra-high-strength steel laser welding porosity of the present embodiment, it is to carry out according to the following steps:
[0026] Step 1: Before welding, according to the thickness of the plate, process the parts to be welded into double-sided grooves, and grind or clean the processed double-sided grooves and the surfaces on both sides, and grind or clean the parts to be welded. The welding workpiece is fixed on the welding fixture;
[0027] Step 2: Rigidly fix the laser head, the TIG welding torch and the wire feeding mechanism with the fixture;
[0028] Step 3: Set welding process parameters:
[0029] Bottom welding: the defocus amount is ﹣3~﹢3mm, the laser power is 3000~5000W, the arc current is 100~400A, the laser arc spacing is 5~6mm, the welding speed is 50~500mm / min, and the wire feeding speed is 1 ~2m / min; Ar gas is used as the protective gas, and the flow rate is ...
specific Embodiment approach 2
[0035] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the double-sided grooves are double V-shaped grooves, double U-shaped grooves, double Y-shaped grooves or double U-shaped grooves with blunt sides. mouth. Others are the same as in the first embodiment.
specific Embodiment approach 3
[0036] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the laser adopts CO 2 Gas laser, YAG solid-state laser or semiconductor laser. Others are the same as in the first embodiment.
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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.
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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