Laser-MAG welding method for steel plate of medium thickness and superhigh strength
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A welding method and ultra-high-strength technology, applied in laser welding equipment, welding equipment, metal processing equipment, etc., to reduce costs, reduce the time to replace MAG welding guns, and increase the flow of shielding gas
Inactive Publication Date: 2015-12-02
HARBIN INST OF TECH
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[0008] The purpose of the present invention is to propose a new method—laser-MAG hybrid welding method for medium-thick ultra-high-strength steel plates in view of the problems existing in laser-MAG hybrid welding of medium-thick ultra-high-strength steel plates
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specific Embodiment approach 1
[0032] Specific embodiment 1: A kind of laser-MAG welding method of medium-thick ultra-high-strength steel plate of this embodiment, others are carried out according to the following steps:
[0033] 1. Before welding, the parts to be welded are processed into double V-shaped grooves, double U-shaped grooves, double Y-shaped grooves or double U-shaped grooves with blunt edges, and the processed double-sided grooves Grinding or cleaning the surface of the mouth and both sides, and fixing the polished or cleaned workpiece to be welded on the welding fixture;
[0034] 2. Rigidly fix the laser head and MAG welding torch;
[0035] 3. Set welding process parameters:
[0036] Bottom welding: the defocus amount is ﹣3~﹢3mm, the laser power is 3000~5000W, the arc current is 100~200A, the laser arc distance is 5~6mm, the welding speed is 50~500mm / min, and the shielding gas is Ar gas , the protective gas flow rate is 30-40L / min;
[0037] Filler welding: the defocus amount is ﹣3~﹢3mm, th...
specific Embodiment approach 2
[0039] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the laser is CO 2 Gas laser, YAG solid-state laser or semiconductor laser. Others are the same as in the first embodiment.
specific Embodiment approach 3
[0040] Embodiment 3: This embodiment is different from Embodiment 1 in that: MAG adopts FroniusTPS4000 MAG arc welding machine and fiber laser-MAG composite welding head. Others are the same as in the first embodiment.
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Abstract
The invention relates to a laser-MAG welding method for a steel plate of medium thickness and superhigh strength and aims at solving problems existing in steel plates of medium thickness and superhigh strength in the laser-MAG composite welding. The method comprises the following steps: 1, before welding, fixing a machining clamp to a position to be welded of a workpiece to be welded; 2, rigidly fixing a laser head and an MAG welding gun; 3, setting welding parameters; 4, adopting a robot integrated system for controlling the welding parameters, wherein firstly, an MAG electric arc is generated, after the electric arc is stabilized for 1-2 seconds, a laser device is controlled to emit laser, and finally a robot is controlled so that the laser working head and the MAG welding gun can move jointly to complete the welding process. The welding method is applied to the field of material processing engineering.
Description
technical field [0001] The invention relates to a laser-MAG welding method for a medium-thick ultrahigh-strength steel plate, 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. Usually, the tensile strength of ultra-high-strength steel is higher than 1400MPa, the toughness is good, and the comprehensive performance is outstanding. In recent years, ultra-high-strength steels, especially ultra-high-strength medium-thick plates (thickness > 8mm), have been more and more widely used in aerospace and weapons fields. The main problems of ultra-high-strength steel welding include: cold cracks, embrittlement and softening in the heat-affected zone. The generation of cold cracks is mainly due to its great hardening tendency, welding tensile stress and th...
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