1.3 Lap-joint, slot and plug welding

1.3.1 Welding details of lap-joint, slot and plug welds are specified in Tab 3.

Table 1 : Typical butt weld plate edge preparation
(manual welding) - See Note 1

Detail	Standard
Square butt	t <= 5 mm G = 3 mm
Single bevel butt	t > 5 mm G <= 3 mm R <= 3 mm 50° <= q <= 70°
Double bevel butt	t > 19 mm G <= 3 mm R <= 3 mm 50° <= q <= 70°
Double vee butt, uniform bevels	G <= 3 mm R <= 3 mm 50° <= q <= 70°
Double vee butt, non-uniform bevels	G <= 3 mm R <= 3 mm 6 <= h <= t/3 mm q = 50° a = 90°
Note 1 : Different plate edge preparation may be accepted or approved by the Society on the basis of an appropriate welding procedure specification.

Table 2 : Typical butt weld plate edge preparation
(manual welding) - See Note 1

Detail	Standard
Single vee butt, one side welding with backing strip (temporary or permanent)	3 <= G <= 9 mm 30° <= q <= 45°
Single vee butt	G <= 3 mm 50° <= q <= 70° R <= 3 mm
Note 1 : Different plate edge preparation may be accepted or approved by the Society on the basis of an appropriate welding procedure specification.

Table 3 : Typical lap joint, plug and slot welding (manual welding)

Detail	Standard		Remark
Fillet weld in lap joint	b = 2 t2 + 25 mm		location of lap joint to be approved by the Society
Fillet weld in joggled lap joint	b >= 2 t2 + 25 mm
Plug welding	t <= 12 mm l = 60 mm R = 6 mm 40° <= q <= 50° G = 12 mm L > 2 l	12 mm < t <= 25 mm l = 80 mm R = 0,5 t mm q = 30° G = t mm L > 2 l
Slot welding	t <= 12 mm G = 20 mm l = 80 mm 2 l <= L <= 3 l, max 250 mm	t > 12 mm G = 2 t l = 100 mm 2 l <= L <= 3 l, max 250 mm