法兰的焊接应依据可靠的焊接工艺评价，以确保焊接质量。
Flange welding should rest on the reliable welding craft appraisal to guarantee the welding quality.
CO2混合气应用在低碳钢焊接上，可以改进焊接工艺，提高焊接质量，降低焊接成本。
The application of Ar-CO2 mixed gas in the welding of low-carbon steel could improve welding process, increase welding quality and decrease welding cost.
焊接工艺认证试验是在焊接生产中根据欧洲标准，验证焊接工艺、保证焊接质量，从而满足大规模生产需要的重要试验。
Welding process certification test is an important test complied with EN standard to validate the welding process, ensure the welding quality and meet the requirements of manufacture in large scale.
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