7B52-T6防弹铝合金中厚板MIG焊工艺研究

Research on MIG welding process of 7B52-T6 bulletproof aluminum alloy medium thick plate

采用MIG焊,以ER5356焊丝为填充材料对18 mm厚防弹铝合金板材7B52-T6进行焊接工艺试验,分析对接接头焊缝显微组织和力学性能,为防弹铝合金中厚板的焊接提供试验依据和理论支撑。结果表明,选定的焊接材料和制定的焊接工艺合理可行,无损探伤、宏观金相试验未发现焊接缺陷,能够满足Ⅰ级焊缝质量要求,焊接接头的抗拉强度平均值达到287.3 MPa,焊接系数约为0.52;该项焊接工艺评定各项性能均达到相关要求,评定合理,可用于指导7B52-T6铝合金结构件的焊接。

The welding process of 18 mm thick 7B52-T6 bulletproof aluminum alloy plate is studied by MIG welding with ER5356 welding material as filler material.The microstructure and mechanical properties of butt joint are analyzed,which provides experimental basis and theoretical support for the welding of bulletproof aluminum alloy medium thick plate.The results show that the selected welding process and materials are reasonable and feasible,no welding defects are found in NDT and macro metallographic test,which can meet the quality requirements of the gradeⅠweld.The average tensile strength of the welded joint reaches 287.3 MPa,and the welding coefficient is about 0.52.The performance of the welding procedure qualification has achieved the relevant requirements,and the evaluation is reasonable,which can be used to guide the welding of 7B52-T6 aluminum alloy structural parts.