氧化铈对低合金钢焊条焊缝硫磷的影响

Influence of ceria on phosphorus and sulphur of low alloy steel weld

试验中在E5515—G型低合金钢焊条药皮中过渡了不同含量的稀土氧化铈,目的是提高焊条性能.采用的试验有焊接接头冲击韧度试验,焊缝金属金相组织试验,X射线荧光光谱试验.结果表明,加入适量的氧化铈能够对焊缝进行脱硫、脱磷,提高熔敷金属的冲击吸收功.氧化铈的加入量不同,脱硫效果不同,且差异较大,而脱磷效果并不十分明显.药皮中加入氧化铈可以细化焊缝组织,但氧化铈的加入量应适当.当氧化铈加入量为3%时,焊缝的组织最细小.当氧化铈加入量最佳时,焊缝金属硫的减少量可达58.13%,而磷的减少量为14.29%.

The coating of E5515-G,a low alloy steel electrode,was added in different amount of ceria（CeO2） for enhancing electrode properties which was studied by means of impact toughness,metallographic examination and X-ray fluorescence spectrometry test.The results show that the proper addiction of CeO2 is beneficial to the desulfurization and dephosphorization of the weld and improves the impact absorbed energy of deposited metal.Different addition amount of CeO2 can lead to various desulfurization efficiency,which makes a great difference,whereas the dephosphorization efficiency is unconspicuous.The microstructures of the weld can be effectively made fine by adding CeO2 into electrode coating,but the addition amount of CeO2 should be proper.The microstructure of the weld is the finest when the addition amount of CeO2 is 3%.When the amount of CeO2 is optimal,the S content in weld metal will decrease by 58.128 1%,while the P content 14.285 7%.