1. Oxyfuel Gas Welding: Flat Position

2. 4 Basic Positions In Welding
Flat-
Also known as “down hand welding”
The easiest and most efficient position
Horizontal
Vertical
Overhead

3. Holding The Torch
Held Like A Pencil
Held Like A Hammer

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

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

6. Torch Angles
Travel Angle
Work Angle
Push Angle
Drag Angle

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

8. 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

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

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

11. 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

12. 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

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

14. 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

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