A laser arc hybrid welding method and fixture for thick plate high-strength steel

Abstract

The invention relates to a laser and electric arc combined welding method for thick high-strength steel plates and a clamp for the method. A 45-mm thick high-strength steel is welded with a 6-KW fiber laser and through a double-sided welding forming method, small double-sided grooves are opened, and a 1mm-1.5mm gap is reserved, accordingly, the 45-mm thick high-strength steel can be completely welded. Compared with traditional multi-layer multi-pass welding which requires at least 20 passes of welding, the combined welding method has the advantages that the progress is apparent, preheating processes are simplified, preheating time is shortened, and welded joint performances reach client required indexes; the production efficiency is improved apparently, consumption of base metal and welding wires is reduced, energy consumption is decreased, the mechanical property of welded joints is improved, the residual stress and the deformation are reduced, automation of production can be easily achieved, and the like. The special clamp is a combined clamp with four pressing plates arranged on the upper portion and a base plate used on the lower portion during welding so as to improve the efficiency and quality of the welding method. By means of the clamp, a workpiece can be positioned and fixed, the welding quality is guaranteed, and the workpiece cannot be abraded.

Description

technical field [0001] The invention belongs to the technical field of material processing, and in particular relates to a laser arc hybrid welding method for thick plate high-strength steel, and also relates to a fixture for the laser arc hybrid welding method. Background technique [0002] With the increasing size of industrial and national defense equipment and the wide application of welded metal structures of thick plates and ultra-thick plates, narrow-gap welding of large and thick plates has gradually become the focus of attention. Increasing the welding depth gradually and obtaining a reliable and stable welded joint at the same time is the research direction of thick plate welding. A lot of research has been done over the years. Pages 51-52 of the third issue of "Modern Welding" published in 2010 introduced a stainless steel welding method with a material of 00Cr19Ni10 and a plate thickness of 56mm. Manual argon arc welding was used first, and submerged arc welding...

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Problems solved by technology

The disadvantage is that the carbon dioxide laser has a low absorption rate of the metal, most of the energy is reflected or converted into heat, the energy utilization rate is low, the cost is high, and the multi-pass welding is still used, which is inefficient

Another document introduces a high-power laser wire-filling welding of thick plates, using a 15KW carbon dioxide laser, single-sided welding and double-sided forming welding of 11mm thick domestic marine steel plates. The disadvantage is that the energy utilization rate of carbon dioxide laser is low. , but the welding depth is not very satisfactory, and the cost of 15KW carbon dioxide laser is very expensive

At present, there is no relevant method for fully adopting laser arc hybrid welding to weld high-strength steel plates with a thickness of more than 40mm.

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