High frequency-wire filling laser welding composite welding device and method

Abstract

The invention discloses a high frequency welding-wire filling laser welding composite welding method and device. According to the method, high frequency welding is combined with wire filling laser welding, certain gaps are reserved between to-be-welded workpieces, wire filling laser welding is conducted while high frequency current is fed to base metal, through the strong skin effect and proximityeffect of high frequency current, base metal of a molten pool and base metal on the two sides of a weld seam on the front edge of the molten pool generate high frequency resistance heat, a part of welding energy is directly fed into to-be-welded faces of the base metal, reverse figuration of wire filling laser welding can be remarkably improved with low heat input, the weld penetration of wire filling laser welding is increased, and the welding efficiency ( the welding speed) is improved. The composite welding device comprises a welding platform, a high frequency feeding contact electrode, alaser welding head, the to-be-welded workpieces, a high frequency power supply and a welding wire. The welding method and device can also be used for dissimilar metal butt welding-brazing, through thehigh frequency preheating effect, brazing flux is melted advantageously, surface oxidation films of the workpieces are advantageously removed, welding forming is facilitated, and welding defects arereduced.

Description

technical field [0001] The invention belongs to the technical field of technical material processing and welding, and in particular relates to a high-frequency-laser wire-filling composite welding device and method. Background technique [0002] Laser welding is an efficient welding technology that emerged in the 1970s. It uses high-energy-density laser as a heat source to melt the weldment to form a welded joint, which is an efficient and precise welding method. Traditional laser welding adopts gapless welding, which requires high surface treatment of the welded parts and strict requirements for workpiece assembly. At the same time, the heat input of laser welding is low, the cooling rate of the weld metal is high, and the high-strength alloy joints are prone to produce large residual stress after welding, and even cooling cracks in the weld. Furthermore, due to the high cost of high-power lasers, the laser welding capacity of industrial production is usually limited, a...

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Problems solved by technology

The above invention patents do not utilize the proximity effect and skin effect of high-frequency current in principle, and the heating range involves the entire base metal rather than limited to the molten pool and the side wall of the weld, which has a large thermal impact on the base metal and low heating efficiency

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