Differences between argon-electric welding and downward welding

Downward welding refers to the process in which, during vertical welding or when welding pipes together horizontally, the electrode is used to weld from top to bottom; there are specialized electrodes designed for downward welding. Argon-electric welding involves using TIG welding for the root pass and shielded metal arc welding for the filler and cap passes; for the same weld joint, TIG welding is performed first, followed by shielded metal arc welding. Downward welding is the direction in which the welding rod moves during vertical welding; the other direction is upward welding, which is more difficult than downward welding. The welding positions include overhead welding, horizontal welding, vertical welding, and backside welding, with the difficulty increasing from left to right. TIG welding is a type of gas-shielded welding technique; other welding methods include shielded metal arc welding, carbon dioxide gas shielded welding, submerged arc welding, and so on

What are the differences between argon-electric welding and pure electric welding or TIG welding? Where is it commonly used? Are there any standards available for reference? Thank you!

It’s mainly a matter of cost-effectiveness; there are generally no issues with the manufacturing process. Transporting argon over long distances is difficult, and the field conditions do not meet the high requirements of TIG welding. Considering the need for tight welds in the equipment area, as well as the ease of obtaining argon, TIG welding combined with arc welding is often used. We have also carried out work on long-distance pipelines using this combined welding method, but only on short sections; it involves ordinary 20# steel, used to connect gate stations to distribution stations