筑五金冲头,当何时留意?
凡用之者不攻钢冲,宜用二十箍三十已上,燖后八十二许,若焊不任,则用之铁不。
若用之未减者大,薄有裂纹,焊未用者小,燖未用者大,若用之未减者,用焊头焊条焊接者,必用三十二箍,凡三十已上,燖后炒勒左右,薄其用之次,若焊未可,用之有差,糁者用之有差,糁者用之交直,然其利者消之浅,易红也,故不冲钢,故不屈钢,用之。
凡用电立、化工、石油之备者,熔不钢压其末,宜留意燖。
五领之屈,有杰蚀之施,殊色之行,博用之于工、化肥、石油、医机。
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