But in the backing welding, columnar grain-growth will be appeared in the direction of crystal direction, it effects the welding quality seriously.
但是单面焊打底层焊缝中出现的沿焊缝柱状晶结晶方向的柱状气孔，严重地影响着船舶焊接质量。
Welding methods and technology of narrow gap quirk backing weld were discussed. Indirect quirk backing weld using manual hydrogen arc welding is considered as the best result.
讨论了窄间隙深槽打底焊焊接方法和工艺，认为用手工氩弧焊进行单面深槽打底焊效果最好。
Where backing welds are radiographed for their full length to meet code requirements before clad side high alloy welding is done, this requirement may be omitted with prior approval of the Purchaser.
在复合侧高合金焊接之前，如果要对打底焊道在全长上进行射线检测，则事先经买方同意后可忽略此项要求。
They cause all the welding of double tubes, joint boxes and gas-collecting tubes to realize the backing weld of TAW-P. The quality of the double tube waste heat boilers have been improved.
并对喷嘴、规范参数、坡口形式等作了相应改进，使双套管、联箱、集气管的焊接全部实现了钨极氩弧焊打底，从而提高了双套管废热锅炉的质量。
This welding backing is used with all one-side processes. Especially for those which do not demand back bead cleaning.
本衬垫可用于各种单面焊接工艺的位置，特别适用于不一定要求封底焊道的场合。
In order to increase the volume deformation rate as LPG bottle broken, a boss-backing has been developed for welding the bottles.
为提高液化石油气钢瓶破裂时的容积变形率，研制了带有凸台结构的焊接衬圈。
This backing is uesd for CO2 one-side welding of bulb steel.
本衬垫适用于各种球扁钢对接接头CO2气保护单面焊用。
The advantages of this backing, the concept designed for it, welding procedure and successful use in production are introduced in the paper.
论述了焊接凸台衬圈的优点、改装工艺及在产品上的应用。
This backing(internal) is specially designed for CO2 one-side welding of angle steel butt joints. Different backing sizes are supplied.
本衬垫适用于角钢对接内接头CO2单面焊使用，有各种规格供选用。
This backing is used for one-side automatic welding to reinforce F/G layer. It is also easily used at bending parts.
本衬垫供单面自动焊接用F/G层的加强，也易用于弯曲部分。
This backing is used for one-side automatic welding to reinforce F/G layer. It is also easily used at bending parts.
本衬垫供单面自动焊接用F/G层的加强，也易用于弯曲部分。
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