Chemical Engineering Novice – Questions regarding the selection of pipeline welding processes
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Common welding methods include TIG welding and MIG welding. How can one determine when to use TIG welding and when to use pure argon welding? How to choose between these two methods: based on the wall thickness of the pipe or based on the grade of the base material?
I checked on Baidu, and it says that for pipes with a diameter of DN50 or less, pure argon welding is used; for pipes with a wall thickness of less than 4 mm, pure argon welding is also applied, while for larger-diameter pipes, argon-electric hybrid welding is used. Is there a prerequisite for this distinction?
This post was last edited by wanlirn on 2021-3-24 at 13:07. Generally, for small-diameter, thin-walled components, pure argon is used. As for determining the exact amount of argon to use, it’s quite difficult; the main factor is production efficiency. After all, manual welding and submerged arc welding are much more efficient than TIG welding. The quality rate of welds made using TIG welding as a backing process is much higher compared to other methods. Therefore, for pipeline welders, TIG-electrode welding is an essential skill