Oxyfuel Gas Welding: Flat Position

4 Basic Positions In Welding Flat- Also known as “down hand welding” The easiest and most efficient position Horizontal Vertical Overhead

Holding The Torch Held Like A Pencil Held Like A Hammer

Forehand Welding Torch tip is held so that the flame is pointing in the direction of travel

Backhand Welding Torch tip is held so that the flame is pointed away from the direction of travel

Torch Angles Travel Angle Work Angle Push Angle Drag Angle

Travel Angle Angle between a line perpendicular (90°) to the weld axis Proper angle to create a weld pool is (35-45°)

Work Angle Angle between a line perpendicular to the major work piece and a plane determined by the centerline of the torch tip and weld axis

Push Angle Angle used during forehand welding when the welding end of an electrode or a gas flame points in the direction of travel

Drag Angle Angle used during backhand welding when the welding end of an electrode or gas flame points opposite the direction of travel

Creating A Continuous Weld Pool Weld Pool- small pool of molten metal that is formed directly below the welding flame Penetration is controlled by the width of the weld pool. The width of the pool should increase as the metal gets thicker. A wider pool results in deeper penetration

Selecting A Welding Rod A welding rod is added to a weld pool to accomplish: Fill a groove weld Form a fillet weld Fill a weld pool that has a depression in it Make a completed weld as strong as the base metal

Welding Rod Sizes 1/16th (16mm) 3/32nd (2.4mm) 1/8th (3.2mm)

Laying A Weld Bead Adding filler metal to a weld pool Flat Bead Weld- a flat bead contour used when the bead will be ground down or machines Convex Bead Weld- a weld bead with a surface that curves outward, away from the root of the weld

Your Assignment Define Technical Terms (Page 271) Review Question #1-10 (Page 286)