The repair practice proved that: by means of adopting reasonable welding repair process, the welding repair of lube oil cooler head made by cast iron was successful.

修复实践表明，通过采用合理的焊接修复工艺，铸铁制油冷器封头的焊接修复是成功的。

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Characteristics, principle, process and application result of the technique to use melting diffusing welding to repair defect of gray iron castings was described.

介绍了溶解扩散焊修复灰铸铁铸件缺陷技术的特点、原理、工艺及应用效果。

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By using manual arc welding to repair the big kiln circle, the welding process of ZG310-570 super thick cast steel piece was a success, with good running effect observed for more than 5 years.

通过对大窑轮圈采用手工电弧焊的方法进行修复，成功地解决了ZG310 - 570铸钢特大厚件的焊接工艺，经过5年多的运行观察，使用效果良好。

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