21. "WeldPrint " for arc welding became available in mid-2001. 22. A full facemask may be required for arc welding . 23. He supervised the development of automatic submerged arc welding . 24. Experimental studies on automatic arc welding started in 1934. 25. In addition, manufacturing technique was also modified, with arc welding replaced the original spot welding. 26. Other arc welding processes include atomic hydrogen welding, electroslag welding, electrogas welding, and stud arc welding. 27. Gas tungsten arc welding is most commonly used. 28. Other arc welding processes include atomic hydrogen welding, electroslag welding, electrogas welding, and stud arc welding . 29. Nikolay Benardos introduced the arc welding , further developed by Nikolay Slavyanov, Konstantin Khrenov and other Russian engineers. 30. With conventional arc welding faceshields, you cannot see a thing thru them unless the arc is burning.
