气缸体与气缸盖之间的接合处必须保持密封，并且能够承受燃烧室产生的高压和高温。
The joint between the cylinder Block and the head must be tight and able to withstand the pressure and heat developed in the combustion Chambers.
尤其是旋转接合面大小必须减低到最低限度做较高压力的旋转接合。
Especially the area of contact face of rotation has to be minimized to the minimum to allow rotation connection under high pressure.
结果表明：射线探伤检验，中压电子束焊接合格率优于高压电子束焊接；
The results show that the qualified ratio of medium-pressure electron beam welding is higher than high-pressure electron beam welding in radiographic inspection.
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