In Comparison with other types of welders, there are many advantages in this DC-Welder. The paper presents the principle, features, main technical parameters, testing results and its applications.

与其他类型焊机相比较，本焊机具有许多优点。本文介绍该焊机的工作原理、特点、主要技术参数、测试结果与应用。

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As stipulated by"the testing regulation of container of pressure of boiler to welder", the prototype of arc welding to the joined slit must be completed through the crafts of groove by bevelling.

前言： 根据“锅炉压力容器焊工考试规则”规定， 对接缝手工电弧焊的考试试板必须采用单面焊双面成形工艺完成。

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