焊接工艺对T92/S30432异种钢接头δ铁素体的影响

Effect of welding process on δ ferrite in T92/S30432 dissimilar welded joint

采用自动氩弧焊,选用不同焊接工艺对T92和S30432异种钢进行了焊接,研究了异种钢接头中δ铁素体的分布情况以及焊接工艺变化对δ铁素体含量的影响。结果表明:T92/S30432异种钢接头熔合区存在块状的δ铁素体,其性质是合金铁素体,沿熔合区方向呈带状分布,且在焊接接头上不均匀分布,焊接接头底部和表面区域δ铁素体含量高、尺寸大,其他区域极少;ERNiCrMo-3焊丝和小坡口角度下异种钢接头中δ铁素体含量较高,其他焊接工艺参数变化(层间温度、焊接层数、热处理温度)对δ铁素体含量影响较小。

The welded joints of dissimilar steels of T92 and S30432 were prepared by TIG automatic welding process using different welding conditions.The distribution of δ ferrite in the dissimilar welded joints and the effect of welding conditions on the content of ferrite were studied.The results reveal that the block δ ferrite,which is alloying ferrite,is distributed in the fusion zone.The amount and the size ofδ ferrite in the bottom and upper zones of the dissimilar welded joint are higher than that in the other zones.The ERNiCrMo-3 filler metal and the small groove angle exhibit a large effect on the δ ferrite.However,the other parameters such as welding interpass temperature,layer number and PWHT temperature show no significant effect on the δ ferrite distribution.