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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 the toughness requirements of low carbon bainitic steel welded joints, a kind of sintered flux designed by using different welding line energy is selected to submerge arc welding of low carbon bainitic steel. The microstructure and properties of welded joints were studied by means of metallographic analysis and mechanical properties testing. The results show that the HAZ impact toughness of the welded joints is excellent when the welding line energy is 26.86 kJ / cm, reaching 254 J, but the toughness of the weld zone is poor, which is only 86%. When the energy of welding line is 29.45kJ / cm, the performance of welded joint is relatively excellent, and the impact energy of weld zone and HAZ is 167 and 159 respectively. Under this welding line energy, the weld zone is organized into granular bainite and inclusions with dispersed particles are precipitated. When the welding energy of single filament submerged arc welding is about 29.45 kJ / cm, it is most suitable.