Microstructures and Mechanical Properties of TA2 Plate Joint Welded by Key Hole TIG
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摘要: 研究了10 mm厚TA2板小孔TIG焊接头微观组织、显微硬度、抗拉强度、工艺性能及冲击性能,对焊缝中心冲击断口进行了扫描电镜观察。结果表明,采用优化小孔TIG焊工艺可不开坡口实现10 mm厚TA2板的单面焊双面成型;大焊接电流导致焊缝组织较母材粗大,但焊缝中心冲击吸收功未见显著降低,且熔合线附近还略高于母材的;接头未出现明显硬化或软化,接头强度与母材的相当,工艺性能良好。Abstract: Key hole TIG welding of 10 mm thick TA2 plate was conducted. The microstructures, hardness, tensile strength, bending properties and impact properties of the welded joints were investigated. The impact fracture of the specimens with notch machined at the center of weld was observed by scanning electron microscope. It has been verified that one side welding both sides formation of 10 mm thick TA2 plate without notch can be successfully obtained by using the optimized TIG welding parameters; high welding current accounts for coarse grains of the weld, but impact value in the weld center doesn't reduce obviously and that around the fusion line is slightly higher than that of the base material; the joint has good bending performance; the strength and hardness are equal to those of the base material.
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Keywords:
- key hole TIG welding /
- microstructure /
- mechanical property /
- charpy impact toughness
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