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Weld procedure specification and qualification records and welders qualification record .

焊接程序规范及资质记录，以及焊工的资质记录。

A number of individuals are now in custody , including some unlicensed welders .

多名人员已经被拘留，包括一些没有执照的焊接工。

List of tube welders companies in russia .

名单的公司在新加坡电焊工管。

A preliminary investigation indicated that unqualified welders caused the fire , the xinhua news agency said .

初步调查表明，火灾是由于不合格的电焊人员所引起，新华新闻机构说。

There are two basic ways to accomplish portability : inverters and engine-driven welders .

有两个基本途径实现便携性:逆变器、发动机驱动焊机.