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1985年我厂一吨气锤锤杆在使用过程中发现距锤头110～200mm处沿锤杆横断面作径向分布深浅不一致的裂纹,几乎布满全周,裂纹最深处达40mm,裂纹展开长度达682mm。立即派人去原生产厂,经了解该产品因设计不合理属淘汰产品不再生产,因此无备件供应。而我厂生产又急需使用,经研究决定采用焊接法来修复锤杆。锤杆材料42CrMo属低合金高强钢,但因工作温度在520℃以下,故把它当耐热钢来对待。 1.焊接工艺试验 42CrMo母材难以买到,故用相近的35CrMo代替。试件焊好后做抗拉强度,弯曲和
In 1985, one ton hammer hammer rod of our factory found inconsistent cracks in the radial distribution along the cross section of the hammer rod from the hammerhead at 110 ~ 200mm, almost covering the whole week, reaching the depth of 40mm and cracking Length of 682mm. Immediately sent to the original production plant, the understanding of the product due to unreasonable design of the product is no longer out of production, so no spare parts supply. The production of our plant and the urgent need to use, the study decided to use welding method to repair the hammer. Hammer rod material 42CrMo is a low alloy high strength steel, but because of the working temperature below 520 ℃, so treat it as heat-resistant steel. 1. Welding process test 42CrMo base metal is difficult to buy, so with similar 35CrMo instead. After welding the specimen to do tensile strength, bending and