Study on Process Characteristic and Mechanical Properties of Laser Welding with Filler Wire for Dissimilar Galvanized Steel Sheets

ZHOU Mu; ZHOU Linzhu; LI Jinbao; ZHOU Chuanchuan; GU Hao; JIANG Yifan

doi:10.7512/j.issn.1001-2303.2023.05.09

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Study on Process Characteristic and Mechanical Properties of Laser Welding with Filler Wire for Dissimilar Galvanized Steel Sheets
Vol. 53, Issue 5, Pages: 64-69(2023)
Received：06 December 2022，

Revised：2023-03-11，

Published：25 May 2023
DOI： 10.7512/j.issn.1001-2303.2023.05.09
稿件说明：

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周牧，周林柱，李金宝，等.镀锌钢板激光填丝焊接工艺与接头力学性能研究［J］.电焊机，2023，53（5）：64-69. DOI： 10.7512/j.issn.1001-2303.2023.05.09.

ZHOU Mu, ZHOU Linzhu, LI Jinbao, et al.Study on Process Characteristic and Mechanical Properties of Laser Welding with Filler Wire for Dissimilar Galvanized Steel Sheets[J].Electric Welding Machine, 2023, 53(5): 64-69. DOI： 10.7512/j.issn.1001-2303.2023.05.09.

摘要

车身用镀锌钢板的厚度较薄，采用其他方法焊接制造容易产生较大变形，开发厚度较薄的镀锌钢板激光填丝焊接工艺具有重要工程实践意义。针对车身用0.7 mm厚异种镀锌钢板，开展激光填丝焊接工艺试验，系统研究关键工艺参数（激光功率、焊接速度、离焦量和送丝速度）对焊缝表面和横截面的影响规律，分析焊接接头的微观组织特征和力学性能。结果表明，激光功率、焊接速度、离焦量和送丝速度有较好匹配时，可以获得焊接飞溅少、表面光滑的焊缝；焊接接头拉伸试样在强度较弱的母材发生断裂。

Abstract

The thickness of galvanized steel sheet for car body is relatively thin

and it is easy to produce large deformation when welding and manufacturing by other methods. Therefore

it is of great theoretical and practical significance to develop the laser filler wire welding process for thinner galvanized steel sheet. In this paper

the experimental research on laser wire filling welding process is carried out for different kinds of galvanized steel sheets used for car bodies. The influence of key process parameters (laser power

welding speed

defocusing amount and wire feeding speed) on the weld surface and cross section was systematically studied. The microstructure characteristics and mechanical properties of welded joints were analyzed. The results show that when the laser power

welding speed

defocusing distance and wire feeding speed are well matched

the weld with less spatter and smooth surface can be obtained. The tensile specimen of welded joint broke in the base metal with weak strength. This study will provide a theoretical basis and technical support for high-quality welding and manufacturing of galvanized steel sheets.

关键词

Keywords

references

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