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采用激光-氩弧复合焊技术焊接ZM5镁合金,研究激光-氩弧复合焊与钨极氩弧焊对镁合金焊缝成形性与力学性能的影响。成形性分析表明:在焊接速度为5、15 mm/s时,激光-氩弧复合焊能得到良好的焊缝,且无气孔缺陷;而钨极氩弧焊不适于高速焊接,且气孔缺陷明显。抗拉强度分析表明:激光-氩弧复合焊缝平均抗拉强度为246 MPa,屈服强度为94.53 MPa,断裂伸长率为2.48%,均大于钨极氩弧焊,且2种焊缝均呈韧性-脆性混合断裂。硬度测试分析表明:激光-氩弧复合焊缝区平均硬度为63 HV0.05,热影响区硬度值与母材区相当,约为55 HV0.05,均高于钨极氩弧焊的硬度。上述分析说明:激光的干预有利于提高镁合金焊缝成形性和力学性能,适用于焊接速度要求高、情况紧急时的焊接,这为装备镁合金零部件体积和结构损伤的修复与再制造提供了数据依据。
The effects of laser - TIG welding and TIG welding on the weld formability and mechanical properties of magnesium alloy were studied by laser - argon arc welding technology. Formability analysis shows that the laser - argon arc composite welding can get a good weld and no porosity defects at a welding speed of 5 and 15 mm / s, while the TIG welding is not suitable for high speed welding and the stoma defects are obvious . Tensile strength analysis shows that the average tensile strength of laser - argon arc composite weld is 246 MPa, the yield strength is 94.53 MPa and the elongation at break is 2.48%, both of which are greater than that of TIG welding Toughness - brittle mixed fracture. The hardness test results show that the average hardness of the laser - argon arc composite weld zone is 63 HV0.05, and the hardness of the HAZ is equivalent to that of the base metal, about 55 HV0.05, which is higher than the hardness of the TIG welding. The above analysis shows that the intervention of laser is beneficial to improve the weld formability and mechanical properties of magnesium alloy and is suitable for welding with high welding speed and emergency. It provides the repair and remanufacture of magnesium alloy parts with volume and structural damage The data basis.