Our experimental results indicate the necessity of using inert gas as a protective measure in obtaining satisfactory welding effects.

试验结果表明了采用惰性气体保护焊接的必要性。

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If the protective seal is not air proof or poor gas purity, it will also bring welding quality problems.

气路有密封不好的问题，或气体纯度不高，也会引起焊接质量问题。

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According to the different welding materials, if adopts the carbon dioxide gas or mixed gas to be the protective medium to carry out the welding.

根据焊接材料的不同，可采用二氧化碳气体或混合气体作为保护介质进行焊接。

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