Technology and properties of different thickness plates butt joints for carbon steel body laser filling welding

LI Yang; GUO Lijuan; LIU Dongjun; TIAN Hui; WANG Xijun

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Technology and properties of different thickness plates butt joints for carbon steel body laser filling welding
Vol. 48, Issue 6, Pages: 29-36(2018)
Published：2018
DOI：
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DOI：

LI Yang, GUO Lijuan, LIU Dongjun, et al. Technology and properties of different thickness plates butt joints for carbon steel body laser filling welding[J]. Eletric Welding Machine2018, 48(6): 29-36. DOI：

摘要

基于碳钢车体及轨道交通关键结构件对激光填丝焊接技术的需求

针对厚度为2.5mm和4mm车体用碳钢材料的不等厚对接接头

系统开展激光填丝焊接工艺研究及焊接工艺评定

为后续碳钢车体相关结构件的激光填丝焊工艺生产应用提供可靠的技术保证。试验结果表明:焊接接头无气孔、裂纹等缺陷

弯曲试样试样面上均未发现裂纹、气孔和夹杂等缺陷

说明该激光填丝焊接接头焊接质量优良

接头抗拉强度约为480 MPa

满足母材的要求;从拉伸试样断裂位置来看

均断于母材

说明拉伸试验体现的母材的强度试验结果

同时说明该焊接接头能满足结构对于强度的设计要求。

Abstract

Based on carbon steel car body

the key structure of rail transit demand for laser wire filling welding technology

according to the different thickness plates butt joints of carbon steel for car body with the thickness of 2.5 mm and 4 mm

systematically research on laser wire filling welding process and welding procedure qualification

provide reliable technical guarantee for subsequent carbon steel car body structure of laser wire filling welding process production application.The results show that

the welding joint and bending specimens with no defects such as porosity crack

which shows that laser filling welding joint has excellent welding quality.The joint tensile strength at around 480 MPa and it meets the requirements of the base metal.From the point of fracture of the tensile samples

they are all broken in the base metal

indicating that the tensile test reflects the strength test results of the base metal

and that welding joint can meet the design requirements of the structure for strength.