许多工程机械（特别是进口设备）的缸盖是用铸铝制成的，缸盖是发动机中结构最复杂的零件，不但价格昂贵，而且难以买到。长期使用后会出现裂缝或损伤，再加上冷却水的化学腐蚀，水口周围的金属还会剥离或脱落，此时必须进行修复才能继续使用。铝制缸盖的焊修难度大，现将我们 Many construction machinery (especially imported equipment) cylinder head is made of cast aluminum, cylinder head is the most complex structure of the engine parts, not only expensive, but also difficult to buy. Long-term use will be cracks or damage, coupled with the chemical corrosion of cooling water, the water around the metal will peel or fall off, this time must be repaired in order to continue to use. Aluminum cylinder head welding difficult to repair, now we