厚板钛合金等离子-钨极氩弧复合焊接接头组织与性能
Microstructure and mechanical properties of P-T hybrid welded joints of thick plate titanium alloy
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摘要: 针对16 mm厚TA2钛合金板材进行等离子打底+钨极氩弧焊盖面的复合焊(plasma-tungsten inert gas welding，P-T复合焊)，采用小孔型等离子焊实现不开坡口单面焊双面成形。结果表明，焊缝的组织为少量锯齿形α-Ti+针状马氏体，未发现成分偏析与聚集、夹杂物及裂纹等缺陷。热影响区及熔合线为锯齿形α-Ti+板条马氏体组织。焊缝的抗拉强度达到486 MPa，与母材相当，且断裂位置位于热影响区。在较优的工艺参数下进行焊接，焊缝及热影响区的维氏硬度分别为175 HV和170 HV，均高于母材。因此P-T组合焊接能实现钛合金厚板焊接，在厚板钛合金焊接中具有广泛的应用前景。创新点： 首次采用等离子打底和氩弧焊盖面的复合焊接方法实现16 mm厚钛板无缺陷焊接。
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关键词:
- 钛合金 /
- 等离子-钨极氩弧复合焊 /
- 微观组织 /
- 维氏硬度 /
- 拉伸性能
Abstract: TA2 titanium alloy plate with 16 mm thickness was tested by hybrid welding process of plasma arc welding for back welding and tungsten inert gas arc welding for cover welding(P-T hybrid welding).Single-sided welding and double-sided forming without beveling was achieved by keyhole plasma arc welding.The results showed that microstructure of weld consisted of a small amount of serrated α-Ti and acicular martensite, no component segregation and aggregation, inclusions, cracks and other defects were found.Microstructure of heat affected zone and fusion line were serrated α-Ti and lath martensite.Tensile strength of welded joints reached 486 MPa, which was equivalent to base materials, and fracture position was located in the heat affected zone.Being welded under preferable welding parameters, microhardness of weld and heat affected zone was 175 HV0.1 and 170 HV0.1, respectively, which were higher than that of base material.Therefore, P-T hybrid welding was capable of welding thick plates of titanium alloys and showed extensive application prospects in welding of thick titanium alloys.Highlights: For the first time, defect-free welding of 16 mm thick titanium was achieved by P-T hybrid welding-
Keywords:
- titanium alloy /
- P-T hybrid welding /
- microstructure /
- microhardness /
- tensile properties
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