我厂的三菱汽車中有一台发动机缸盖的排气孔与噴油孔之間产生一条裂紋(长20毫米),使水套漏水,无法使用。我們采用黄銅焊条热焊、高溫回火工艺,解决了这一問題。經装車使用,效果基本滿意。汽缸盖一般为灰鑄鉄,强度低、塑性差,可焊性不好,工件的壁厚也不均匀,厚的地方达10毫米以上,薄的地方仅有2～3毫米,且体內多孔。焊接时应力較大,加热不均匀时很容易引起裂紋。焊后冷却 There is a crack (20 mm long) between the exhaust hole of the engine cylinder head and the injection hole in Mitsubishi Motors of our factory, which makes the water jacket leak and can not be used. We use brass welding hot welding, high temperature tempering process to solve this problem. After loading, the effect is basically satisfactory. Cylinder head is generally gray cast iron, low strength, poor plasticity, poor solderability, the workpiece wall thickness is not uniform, thick place up to 10 mm above the thin place only 2 to 3 mm, and the body porous . When the welding stress, uneven heating can easily lead to cracks. After welding cooling