研究了DP590 低成本热轧双相钢采用合适的焊丝、焊剂及合理的焊接工艺后，钢板焊接接头的拉伸性能、冲击韧性及硬度的变化情况。证明了实验钢具有优良的抗软化能力和冷弯成型性能且淬硬倾向不明显。实验表明，开发的DP590 低成本热轧双相钢焊接性能优良，适于焊接制造汽车车轮、横梁、纵梁等构件。

The tensile properties，impact toughness and hardness of the welded joints of DP590 low-cost hot rolled dual phase steel using appropriate welding wire，flux and reasonable welding process was studied. The excellent softening resistance，cold bending formability and low hardening tendency of the test steels was shown. Experimental results showed that the DP590 low- cost hot rolled dual phase steel with good welding performance was suitable for welding car wheels and beams，etc.