双丝埋弧焊接头性能研究

在16Mn钢板上进行双丝自动埋弧焊工艺试验,得到了不同焊接速度下的焊件.对不同工艺参数下得到的焊接接头试样进行了拉伸试验、硬度测试以及金属显微组织观察,并计算了双丝自动埋弧焊时的熔敷率.结果表明:采用双丝埋弧焊得到的焊缝外形美观;金属熔敷率与焊接速度成反比;随着焊接速度的降低焊接线能量相应的增大,较长的高温停留时间会促...

Research on joint property of twin wire submerged arc welding

The welding of 16Mn steel plate is conducted using twin wire submerged arc welding technology.The weldments are prepared under the condition of the different welding speeds.For the welded joints obtained by above-mentioned welding processes,the tensile tests of the welded joints are performed,the hardness of the joint metal is measured,and the welded joint microstructure is observed.Moreover,the metal deposition rate is calculated based on the basis of the experimental data.The results show that the excellent welding bead shape is easily obtained by twin wire submerged arc welding process.The metal deposition rate is inversely proportional to the welding travel speed.The decrease of welding speed results in the corresponding increase of the welding heat input,the longer existing time of welding pool at elevated temperature causes to the relatively coarse grain microstructure of both HAZ and weld metal.The tensile and the yield strength of the joints obtained by above-mentioned welding processes are distinctly different.The microhardness of weld metal is increased and the toughness of welded joints is decreased as the welding travel speed is increased.