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为了提高点焊电极焊接镀锌钢板时的使用寿命,复相结构的Ti B2-Ti C涂层电极在点焊镀锌钢板过程中被采用。文中采用SEM、XRD分析手段分析了Ti B2-Ti C复相涂层电极点焊镀锌钢板时的失效过程。分析结果说明,由于受机械力和焊接热等诸多因素的影响,使原本完整的Ti B2-Ti C复相涂层产生裂纹。裂纹扩展交织成网状,增加了Ti B2-Ti C复相涂层电极与钢板镀层之间的合金化程度。由于局部区域合金化的影响,使得涂层成片脱落,导致了更深程度的合金化,促使Ti B2-Ti C复相涂层电极失效。Ti B2-Ti C复相涂层电极失效,是合金化与塑性变形共同的结果。
In order to improve the service life of the spot welding electrode when galvanized steel is welded, the Ti B2-Ti C coated electrode with the multiphase structure is adopted in the process of spot welding the galvanized steel sheet. In this paper, the failure process of the spot welding of TiB2-TiC composite coating electrode with galvanized steel was analyzed by means of SEM and XRD. The analysis results show that due to the mechanical and welding heat and many other factors, the originally intact Ti B2-Ti C composite coating cracks. The crack propagation was interlaced into a mesh, increasing the degree of alloying between the Ti B2-Ti C multi-phase coating electrode and the steel plate coating. Due to the influence of the alloying in the local area, the coating became flaked off, resulting in a more alloying and failure of the Ti B2-Ti C multi-phase coating electrode. Ti B2-Ti C composite coating electrode failure, is the result of alloying and plastic deformation.