Page 114 - Welding of Aluminium and its Alloys

Table 6.1 (cont.)

Thickness Edge preparation Remarks
(mm)

12.7mm 60° (a) Chip back first
70° to 90° run to sound
metal before
welding
3
/ 16 rad underside.
Preheating may
be necessary
(b) Chip back first
2.4 mm 2.4 mm run to sound
metal and add
(a) 2 or more runs (b) 4 or more runs sealing run.
Preheating may
be necessary
(a) 4.8–6.4mm 90° 90° Preparation for
(b) Over vertical butt welds
6.4–12.7mm using double
operator
technique. One
pass only required
2.4 mm 2.4 mm
(a) (b)

6.2 Manual DC-ve TIG welding repair of aluminium castings using
helium shielding gas. Courtesy of TPS-Fronius Ltd.