Multifocal laser reinforced arc hybrid welding method

Abstract

The invention discloses a multifocal laser reinforced arc hybrid welding method. According to the method, four heat sources, namely the single-focus laser, welding gun arc and the bifocal heat sources are provided and sequentially arranged in the welding direction in series, different heat output can be achieved by changing laser power and current and voltage of a welding gun system, and welding modes required on site are achieved. Bifocal laser adopted by the method is formed by dividing a single laser beam into a bifocal laser beam through an optical beam splitting system, double laser beam focuses vertically distributed in the weld joint direction can do mutual crisscross motion, a molten pool is fully and effectively stirred, when the bifocal laser with high power is used as a welding heat source, the weld penetration is advantageously increased, the molten pool is stirred, pores and splashing are effectively reduced, and meanwhile, the weld joint weld penetration and weld width can be regulated and controlled by finely adjusting the focal distance of the two focuses. When the bifocal laser with lower power is used as a heat treatment heat source, the smooth finish of welded surfaces is advantageously improved, the weld joint uniformity is improved, pores and splashing are effectively reduced, and the weld joint quality is improved.

Description

technical field [0001] The invention specifically relates to the technical field of material processing engineering, in particular to a method for multi-focus laser enhanced arc hybrid welding. Background technique [0002] Laser welding is a new welding method with high energy density, high welding speed, high precision and good for obtaining dense weld structure. Laser welding is one of the important aspects of the application of laser material processing technology, mainly widely used in aerospace, automobile industry, electronics industry and so on. With the rapid development of modern industry, the conventional laser welding technology can no longer meet the needs due to its own defects, such as: the high thermal conductivity of the material to be welded, low ionization energy and high reflectivity to the laser make the optical welding process stable The performance is very poor, which eventually leads to poor weld formation, large fluctuations in penetration depth, hi...

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Problems solved by technology

With the rapid development of modern industry, the conventional laser welding technology can no longer meet the needs due to its own defects, such as: the high thermal conductivity of the material to be welded, low ionization energy and high reflectivity to the laser make the optical welding process stable Poor performance, which eventually leads to poor weld formation, large fluctuations in penetration depth, high weld porosity, high precision requirements for laser assembly, and expensive equipment.

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