旋挖钻机钻杆键条焊接接头的残余应力
赵海燕1, 徐兴全1, 于兴哲2, 朱小武3

Residual welding stresses in the pipe-bar joints of a rotary drilling rig
Haiyan ZHAO1, Xingquan XU1, Xingzhe YU2, Xiaowu ZHU3