Laser arc double-sided synchronous vertical position welding method and device for medium plate

Abstract

The invention discloses a laser arc double-sided synchronous vertical position welding method and device for a medium plate. The method comprises the steps of groove design, backing welding and multi-layer filling welding. The liquid molten drops generated by the GMAW welding gun have a certain distance from the second laser beam for forming the key hole, namely, the liquid molten drops are far away from the key hole, so that the direct impact of the liquid molten drops on the key hole can be reduced, and the problem that the key hole is even blocked by the molten drops after a welding wire is molten due to the fact that the laser forming a molten pool melts the welding wire is solved. Key holes on the two sides are difficult to be communicated, and the stability of the key holes is reduced. The vertical upward welding of the heat sources symmetrically arranged on the two sides can improve the heated symmetry of the two sides of the base metal, so that the heat sources on the two sides are fully compounded, the welding precision is guaranteed, deformation caused by welding stress can be greatly reduced, meanwhile, the filling pass of vertical upward welding of the medium-thickness plate is reduced, and the welding efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of laser welding, in particular to a method and a device for laser arc double-sided synchronous vertical welding of medium and thick plates. Background technique [0002] Vertical welding is one of the important components of all-position welding, and the welding of large metal structural parts must be vertical welding. Due to the difficulty of welding, it still relies on manual arc welding and electroslag welding to a large extent. The welding efficiency of manual arc welding is low and requires professionally trained welding technicians. Although electroslag welding has high heat input and high welding efficiency, the overheating of the structure often causes the performance of the welded joint to decrease. How to effectively improve the welding efficiency and welding quality of vertical welding is an important problem currently faced. [0003] Laser welding has the advantages of high energy density, lar...

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Problems solved by technology

[0004] The object of the present invention is to provide a laser arc double-sided synchronous vertical welding method and device for medium and thick plates, so as to solve the problems in the above-mentioned prior art, improve the energy utilization rate of laser welding, and improve the efficiency of multilayer welding of medium and thick plates; Solve the problem that the welding wire is melted by the laser that forms the molten pool, and the droplet impact or even block the keyhole after the melting of the welding wire is caused. It is difficult to realize the penetration of the keyhole on both sides and reduce the stability of the keyhole. stability

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