摘要:
以2.0 mm厚SAPH440酸洗板为研究对象,通过检测点焊接头的抗剪性能及十字拉伸性能,综合评价接头的力学性能,并使用Axio Obersver A1m型光学显微镜观察点焊接头显微组织,测量熔核直径,分析焊接电流对熔核直径的影响,创建点焊工艺窗口。结果表明:酸洗板点焊工艺窗口为8.5 kA至12 kA,宽度3.5 kA,接头熔核直径及力学性能与焊接电流呈正相关,当出现飞溅后,熔核直径与力学性能略微下降,熔核区与热影响区组织均为马氏体,受焊接热循环的影响,熔核区组织为粗大柱状,热影响区组织为细小针状。
Abstract:
The research object was SAPH440 pickling plate,the thickness was 2.0 mm.Comprehensively evaluated the mechanical properties of the joint by testing the shear and cross tensile properties,Axio Obersver A1 m optical microscope was used for microstructure and nugget diameter examination,and create spot welding process window.The result showed that,the pickling plate spot welding process window was 8.5 kA to 12 kA with a width of 3.5 kA,the nugget diameter and mechanical properties were positively correlated with welding current,when expulsion appeared,the nugget diameter and mechanical properties of the joint decreased slightly.The microstructure of nugget zone and HAZ were both martensite.Due to the influence of welding heat cycle,the structure morphology of the nugget zone was coarse and columnar,and the structure of HAZ was fine and needle-like.
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