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哈尔滨绝缘材料厂的1000吨油压机缸体尺寸如图1所示,缸体材料为50号铸钢,其化学成分为:碳0.53%、锰0.59%、矽0.28%、硫0.021%。多年使用后发现有严重渗油现象。经无损检验,判定缸体筒身上有长度约200毫米的穿透性裂纹一条,另外有一处密集的铸造缩松区。对于裂纹决定采用不预热补焊,对大面积缩松区先将各渗油点不预热补焊后,再往里面衬焊一块4×400×400的低碳钢补板,补板上开四个20×40的孔,进行不预热衬焊。
Harbin Insulating Material Factory 1000 tons of hydraulic machine cylinder size shown in Figure 1, the cylinder material for the 50 cast steel, the chemical composition of: carbon 0.53%, 0.59% manganese, silicon 0.28%, 0.021% sulfur. After years of use found a serious oil leakage phenomenon. After non-destructive testing, cylinder body cylinder to determine the length of about 200 mm of a penetrating crack, in addition to an intensive casting shrinkage zone. For the crack decided not to preheat the welding, the first large area of the shrinkage of the oil infiltration point is not preheating repair, and then lined with a piece of 4 × 400 × 400 lining of low carbon steel plate, Open four 20 × 40 holes for lining without lining.