Tweco 170 HF Weldskill - Manual (Page 29)

WELDSKILL 170 HF INVERTER
4-7 April 23, 2008
4.13 Joint Preparations
In many cases, it will be possible to weld steel sections without any special preparation. For heavier sections
and for repair work on castings, etc., it will be necessary to cut or grind an angle between the pieces being
joined to ensure proper penetration of the weld metal and to produce sound joints.
In general, surfaces being welded should be clean and free of rust, scale, dirt, grease, etc. Slag should be
removed from oxy-cut surfaces. Typical joint designs are shown in Figure 4-10.
Gap varies from 1.6mm to 4.8mm depending
on plate thickness
Joint
Open Square Butt
1.6mm max
1.6mm
Single Vee Butt Joint Not less than
70 °
Double Vee Butt Joint
1.6mm
Lap Joint
Tee Joints
(Fillet both sides of the
joint)
Edge Joint
Fillet Joint
Corner Weld
Plug Weld Plug Weld
Not less than
70 °
Single Vee Butt Joint
Not less than
45 °
1.6mm max
Art # A-07695
Figure 4-10: Typical joint designs for arc welding