A welding backing with sand mould has been invented to realize welding penetration,which fully takes the place of gouging back chipping which has all kinds of shortcomings and disadvantages.

• 研究发明的“背衬砂垫焊接工艺”能够非常容易地实现焊透的目的,可以完全取代落后的碳弧气刨清根工艺,克服了目前常用的碳弧气刨清根所带来的缺点、弊病和不足。