Copyright Goodheart-Willcox Co., Inc. Chapter 7 Gas Metal Arc Welding Procedures and Techniques 73 A B Goodheart-Willcox Publisher Figure 7-10. Gun placement for welding uphill. A—Groove weld. B—Fillet weld. A B Goodheart-Willcox Publisher Figure 7-11. Vertical groove and fillet weld gun placement when welding downhill (vertical down). A—Groove weld. B—Fillet weld.