the period of validity of special equipment welder qualification test is 2 years. and certificate re-examination only needs the welding operation skill test, not needing basic knowledge test.
特种设备焊工合格项目有效期为两年,复证不要求基本知识考试,只进行焊接操作技能考试。
the project position of welder qualification test for long transporting pipe depends on vertical down welding basically, which is namely fixed pipe with axis horizontal welding (5gx).