The results indicate that argon shielding can reduce the nitrogen content but not influence that of oxygen in the weld metal.
结果表明，采用氩气保护使焊缝金属中的氮含量减少，而对氧含量的影响则不大；
2
Many researches in recent years show that the effects of oxygen on weld microstructure and toughness are very obvious.
近年来，许多研究都表明：与合金元素一样，氧对焊缝显微组织和韧性的影响亦十分显著。
3
Decreasing welding thermal input will decrease the oxygen content and the number and size of oxide inclusions, and it improves the toughness of weld metal.