Internal-pressurized laser-electric arc combined sealing welding method for edge joints
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A technology of terminal joints and internal pressure, applied in laser welding equipment, welding/welding/cutting items, welding equipment, etc., can solve the problems of uneven transition, welding leakage root, cracking, etc., to achieve smooth transition, The effect of preventing severe corrosion and preventing crack propagation
Inactive Publication Date: 2019-02-19
HARBIN INST OF TECH
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[0004] Aiming at problems such as collapse and weld leakage that are prone to occur in the large gap position of the thin-walled fuel tank end joint, and problems such as cracking caused by uneven transition at the weld root, the present invention proposes an internally pressurized end joint laser-arc composite seal welding method
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specific Embodiment approach 1
[0019] Specific Embodiment 1: An internally pressurized termination joint laser-arc compound sealing welding method of this embodiment, the preparation method is carried out according to the following steps:
[0020] Step 1: process the parts to be welded of the workpiece to the required accuracy as required, and grind or clean the surfaces on both sides of the workpiece after processing;
[0021] Step 2: fixing the workpiece to be welded after grinding or cleaning on the welding fixture;
[0022] Step 3: Continuously inject argon or argon and carbon dioxide mixture into the workpiece before welding to form a protective atmosphere inside, wherein the flow rate of the protective gas is 10L / min-50L / min;
[0023] Step 4: Set the process parameters, the laser power is 500W~3kW, the defocus amount is +5~+15mm, the arc current is 50A~100A, the shielding gas of the welding torch is argon or argon and carbon dioxide mixture, and the flow rate of the shielding gas is 10L / min~40L / min; ...
specific Embodiment approach 2
[0027] Specific embodiment 2: This embodiment is described with reference to the figure. The difference between this embodiment and specific embodiment 1 is that the laser is a CO 2 Gas laser, YAG solid-state laser or semiconductor laser.
[0028] Others are the same as in the first embodiment.
specific Embodiment approach 3
[0029] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the welding machine adopts TPS4000MIG / MAG welding machine, the current adjustment range is 3-400A, and the voltage adjustment range is 14.2-34V.
[0030] Others are the same as in the first embodiment.
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Abstract
The invention provides an internal-pressurized laser-electric arc combined sealing welding method for edge joints and relates to the field of machining engineering. The internal-pressurized laser-electric arc combined sealing welding method aims to solve the problems that flaws such as collapse, welding leakage and the like are easy to arise in big gap positions of edge joints of a thin-wall fueltank, and crack might be caused by non-gentle transition in welding roots. According to the internal-pressurized laser-electric arc combined sealing welding method for the edge joints, a laser-electric arc combined welding method is adopted; argon or a mixed gas of argon and carbon dioxide is introduced into the interior of the fuel tank before welding; welding is started after a protective atmosphere is formed; a protective gas is introduced continuously in the welding process; and the protective gas flow quantity is determined according to the gap condition of assembling of the fuel tank. Inthe process, because certain pressure exists in the reverse-side protective gas, a molten pool is extruded upwards; with optimized technological parameters of laser-electric arc combined welding coordinated, upward dents are generated in the welding joint bottoms until after-welding transition in positions where the gaps are bigger is relatively gentle. The internal-pressurized laser-electric arccombined sealing welding method is applied to the field of vehicle fuel tank manufacturing.
Description
technical field [0001] The invention relates to a laser-arc composite sealing and welding method for internally pressurized end joints, which belongs to the field of material processing engineering. Background technique [0002] The structural parts of thin-walled container products such as oil tanks and diesel tanks in vehicles in the weapon industry are mainly assembled and welded by 1.5mm-2mm thin-walled low-carbon steel plates, and the end joints are the main joint forms for welding. The welding methods currently used for thin-walled fuel tanks mainly include manual arc welding, tungsten argon arc welding (TIG), CO 2 Gas arc welding, MIG / MAG welding, etc. However, the use of traditional welding methods is likely to cause problems such as large welding deformation, unstable quality, difficult control of welding stress, difficulty in ensuring weld quality and appearance consistency, and occasionally weld leakage occurs during product use. In recent years, methods such as...
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