Welding testWelding Certification Test: How to Weld a Vertical 3G 7018 With a Backing Strip March 4, 2021 - Leave a Comment Facebook Twitter Pinterest Tulsa Welding SchoolThu, March 4, 2021 12:31pmURL:Embed:Do you want to pass the vertical 3G 7018 welding certification? Jack Dulls, Director of Training at Tulsa Welding School, shows you how to do it. Facebook Twitter Pinterest