摘要
HG960高强钢在工程应用时最薄弱的环节是焊接接头的性能,接头性能的好坏制约着高强钢的总体性能。设计平板堆焊试验,将焊接电流、电弧电压作为变量,固定焊速不变,使热输入分别达到8,10,12,14,16 kJ/cm,研究随着热输入的变化,其高强钢焊缝宏观形貌、焊接接头尺寸、显微硬度及显微组织的变化规律。研究发现:随着热输入的变化,焊缝尺寸增大,焊缝熔深与熔宽逐渐增加,热影响区加宽,焊缝组织为明显的针状铁素体,具有较高的强度、良好的韧性及塑性,焊缝性能优于母材性能,焊缝硬度值下降。
The weakest link of HG960 high-strength steel in engineering application is the performance of welded joints.The performance of welded joints restricts the overall performance of high-strength steel.By designing the plate surfacing test,the welding current and voltage were taken as the variable,the fixed welding speed was constant,and the welding line energy reached 8,10,12,14,16 k J/cm respectively.Studying the high-strength steel welding with the change of the welding line energy,the macroscopic morphology,welded joint size,microhardness and microstructure changed.It was found that with the change of welding line energy,the weld size increased,the weld penetration and melting width increased gradually,the heat affected zone widened,and the weld microstructure was obvious acicular ferrite with high strength and good toughness and plasticity.The weld performances were superior to base metal performance.The weld hardness value decreased.
作者
李志强
LI Zhi-qiang(Qinghai Higher Vocational Technical Institute,Haidong 810700,Qinghai pro.,China)
出处
《焊接技术》
2019年第12期20-23,5,共5页
Welding Technology
