Try the technique before you buy with a DIY alternative. Roll a sheet of black card into a cone and place a strip of black or gaffer tape along the seam to hold it securely in place.
在买之前先自己DIY一个，把一张卡纸卷成圆锥型，用电工黑胶粘牢。
The reasonable widths of backup strip are experimented with the strength factor of the welded seam for a particular kind of PVC/PES.
PES背贴焊接缝合试验，得到了应力-应变曲线、背贴条宽度、焊接缝合强度系数；
The defects will be found in the seam side with ultrasonic inspection but hardly found with X ray inspection as the small diameter spiral pipe production with the split strip steel.
采用纵剪带钢生产小口径螺旋焊管时，超声波检验经常在焊缝的一侧发现缺陷波，而X射线拍片检验却很难发现。
应用推荐