This article mainly introduces the application of vertical down welds technique and operation technology in the course of welders' training and in the site of natural gas pipeline.
主要介绍了手工下向焊工艺及操作技术在焊工培训过程和天然气输气管道施工现场的应用。
All the company's divers, diving inspection personnel, and diving welders have undergone formal training and have qualification certificate issued by the domestic authorities.
公司的潜水人员、潜水检测人员、潜水焊接人员均经过正规培训，全部持有国内权威机构颁发的资质证书。
All the company's divers, diving inspection personnel, and diving welders have undergone formal training and have qualification certificate issued by the domestic authorities.
公司的潜水人员、潜水检测人员、潜水焊接人员均经过正规培训，全部持有国内权威机构颁发的资质证书。
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