焊接线能量对低碳贝氏体钢焊接接头性能的影响

Effect of Welding Line Energy on Properties of Welded Joint for Low Carbon Bainitic Steel

根据低碳贝氏体钢焊接接头强韧性要求,选择所设计的一种烧结焊剂,采用不同的焊接线能量,对低碳贝氏体钢进行埋弧焊。通过金相分析和力学性能测试等方法,对其焊接接头的组织和性能进行了研究。结果表明:焊接线能量为26.86 kJ/cm时,焊接接头HAZ冲击韧性优异,达254 J,但焊缝区冲击韧性差,仅为86 J。而焊接线能量为29.45kJ/cm时,焊接接头的性能相对优异,焊缝区和HAZ的冲击功分别达167和159 J。在此焊接线能量下,焊缝区组织为粒状贝氏体,并且有弥散分布的夹杂物颗粒析出,单丝埋弧焊焊接线能量为29.45 k J/cm左右时最为适宜。

According to strength and toughness requirements for low carbon bainite steel welded joint, the design of a sintered flux was selected by, using different welding line energy. The microstructure and performance of the welded joint of low carbon bainite steel were studied by metallographic analysis and mechanical property test. The results show that when the welding line energy is 26.86 KJ/cm,the toughness of HAZ of welded joints is excellent, its impact energy reaches 254J,but the impact toughness of the weld zone is only 86J. While the welding line energy is 29.45 KJ/cm, the performance of the welded joint is relatively low, the weld zone and HAZ impact energy amounted to 167J and 159J. Under the line energy, the weld area microstructure is granular bainite, with the particulate inclusions dispersed precipitates, known in the case of single-wire submerged arc welding, the welding linear energy of 29.45 KJ/cm is most suitable.