不等厚汽车镀锌钢板点焊工艺实验研究
关键词 热浸镀锌钢板 镀锌钢板点焊 熔核成形 熔核截面组织 拉剪试验 硬度
毕业论文设计说明书（论文）外文摘要
Title Experimental study of automotive galvanized steel welding process unequal thickness
Abstract
This paper conducted research ranging from thick galvanized steel welding process test car, the test uses a hot-dip galvanized steel to be welded, the main effect of different process parameters on changes in the mechanical properties of the weld, shape and microscopic affect the organization to optimize the forming process specifications and get a good spot. After ranging study to determine 1.3mm +1.75 mm thick hot-dip galvanized steel welding specification is reasonable: the heat input set at 35% -45%, welding scheduled for 8-10 cycles, cylinder pressure set at 0.3Mpa -0.35Mpa. . Tensile shear tests in the selected welding parameters of the specimen, the shear strength of 365MPa, the tensile strength of the base material reached 70%. Microhardness test, sequentially increasing hardness from thin to thick. Defects during the test is mainly porosity, incomplete penetration and burnt, other defects mainly refers splash. Stomatal pores are mainly internal solder joints, reducing the strength of the solder joints. Incomplete penetration and over-burning process parameters are due to the unreasonable result.
Keywords： Hot dip galvanized steel Galvanized steel welding
Nugget forming Nugget section of tissue
Shear test Hardness
目 次
1 引言 1
1．1 选题背景及意义 1
1．2 镀锌钢板的性能及应用 2
1．3 电阻点焊的发展 4
1.4 高强度钢的研究现状 6
1.5 镀锌钢板点焊工艺的研究现状 7
1.6 本课题研究的主要内容 9
2 试验材料、设备及方法 9
2.1 试验材料 9
2.2 试验设备 10
2.3 试验方法 12
3 不等汽车厚镀锌钢板电焊工艺对焊接质量的影响 14
3.1 焊接电流对焊接质量的影响 14
3.2 焊接时间对焊接质量的影响 16
3.3 电极压力对焊接质量的影响 18
4 焊点性能检测 19
4.1 焊点的拉剪试验 19
4.2 熔核显微硬度的测量与分析 20
4.3 不等厚汽车镀锌钢板点焊的工艺缺陷 20
4.4 本章小结 20
结 论 22
致 谢 23