通过对冲击韧性的测试结果与微观组织的分析，确定出使焊缝冲击韧性最佳的焊接工艺参数。
Meanwhile the optimal welding parameter which was suitable for welding line impact toughness was gained by analysis on the test result of impact toughness and microstructure.
研究结果表明，焊缝具有优良的强韧性匹配，焊接接头强度及冲击韧性均满足管线钢工程焊接技术条件。
The results show the weld has good properties in strength and toughness satisfying the welding demands of pipeline.
在较大焊接热输入条件下焊接，焊缝金属产生粗大先共析铁素体、过热区产生粗大粒状贝氏体，焊接接头低温冲击韧性因此降低。
The coarse primary ferrite appeared in weld metal, and coarse bainite appeared in heat-affected zone under larger heat input welding condition, which caused low...
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