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Laser and electric arc combined welding method for thick high-strength steel plates and clamp for method

A laser arc and hybrid welding technology, which is applied in the field of material processing, can solve the problems of low utilization rate of carbon dioxide laser energy, high cost of carbon dioxide laser, and unsatisfactory welding depth, so as to improve the weld composition and microstructure, reduce Welding defects, effects of increased solidification time

Active Publication Date: 2013-11-27
NANJING ZHONGKE RAYCHAM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

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  • Laser and electric arc combined welding method for thick high-strength steel plates and clamp for method
  • Laser and electric arc combined welding method for thick high-strength steel plates and clamp for method
  • Laser and electric arc combined welding method for thick high-strength steel plates and clamp for method

Examples

Experimental program
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Effect test

Embodiment 1

[0017]Domestic 45mm thick ZG30SiMn, and imported 45mm thick wear-resistant plate AR400, straight seam butt welding of dissimilar materials; workpiece groove form: choose 45mm plate, first open a 10mm, 15-degree groove on one side, and then open a 3mm, 45-degree groove, blunt edge 19mm; pre-welding preparation: before welding, grind the welding part to remove the oxide layer, oil stains, stains, etc. on the part to be welded, and clamp the welding workpiece, and the calibration gap is 1.2mm. After the clamping is completed, spot-fix the necessary positions to control the influence of welding deformation on the clamping gap; preheating before welding: laser preheating is adopted, no other preheating devices are needed, and welding can be performed directly after preheating. The heating method is intermittently repeated, and the preheating temperature is about 200 degrees Celsius. Usually, the heating part is scanned twice, each time is 5-8 minutes, and each time is intermittent f...

Embodiment 2

[0022] As an improvement of the present invention, the preheating treatment and welding operations are all completed by robots. It is necessary to compile the robot programs for preheating, bottoming and covering, and teach them. After adopting this design, welding can Straight line welding seam, circular welding seam, curved welding seam, and welding of various joint forms such as butt joint, T joint and fillet joint can be realized, and the welding accuracy and production efficiency are guaranteed. The rest of the structural features and advantages are exactly the same as in Embodiment 1.

Embodiment 3

[0024] As an improvement of the present invention, it is necessary to pay attention to heat preservation between layers during processing, and the temperature difference between layers is controlled at 1-3°. After adopting this design, the quality and welding effect of the welded parts can be guaranteed. All the other structures and advantages are identical to Embodiment 1.

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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...

Claims

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Application Information

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IPC IPC(8): B23K28/02B23K37/04
Inventor 傅新皓徐国建邢飞刘祥宇
Owner NANJING ZHONGKE RAYCHAM TECH
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