11. And two-arc welding is the most cost-efficient method of welding, or am I mistaken? 12. To calculate the heat input for arc welding procedures, the following formula is used: 13. At that time, Kjellberg was the world s largest manufacturer of arc welding technology. 14. Submerged arc welding was invented the same year and continues to be popular today. 15. In 1932 a Russian, Konstantin Khrenov successfully implemented the first underwater electric arc welding . 16. For arc welding one uses a " consumable " electrode. 17. The American Welding Society's official term is gas tungsten arc welding ( GTAW ). 18. In that same year, plasma arc welding was invented. 19. Arc welding and oxyfuel welding were among the first processes to develop during the 1800s.20. A filter suitable for gas welding, for instance, should not be used for arc welding .
