16MnR钢脉冲埋弧焊接头冲击性能研究

Impact property of 16MnR welded joint by pulsed submerged arc welding

针对埋弧焊时焊接热输入量较大,造成焊接接头晶粒粗大、脆性增大、塑性和韧性指标下降、裂纹敏感性增大的缺点,研究了一种新型的采用直流脉冲电流的埋弧焊工艺—脉冲埋弧焊。以16MnR钢板为试验母材,研究了陡降外特性焊接电源匹配变速送丝系统的脉冲埋弧焊对焊接接头冲击性能的影响。试验结果表明,脉冲埋弧焊可有效减小熔敷金属的成分偏析,细化晶粒,提高焊缝金属的冲击性能。该研究为脉冲埋弧焊开拓了广阔的应用前景,具有重要的工程应用价值。

To solve the disadvantages of SAW(submerged arc weding) such as grain coarsening,increase in the brittleness,decrease in the tenacity and increase in the sensitivity of flaw when SAW is applied with high heat input,a new pulsed current SAW technology was put forward.The armor plate of 16MnR(δ=12 mm) as the test material was chosen,and the effect of pulsed SAW by using sharp-fall output characteristics power source and varying-speed wire feeder on the impact energy of welded joint was investigated.The results of the experiments shows that impact energy can be obviously increased by pulsed SAW,and it can obtain lesser grain size,and decrease the composition segregation of deposited metal.The research has widely prospect in application of pulse submerged arc welding,and it has important merit in practical engineering.