SPW Product Catalogue 2019

WELDING GUIDE
PREHEAT DETERMINATION:
Diagram 1 - Combined Joint Thickness (CJT) calculations for welds shown in black.
t 1
= average thickness over 75mm
For welds between t 1
and t 2
/t 3
, ignore t 4
unless it is already welded to t 2
/t 3
6
75 mm
For welds between t 3
and t 2
, ignore t 1
unless it is already welded to t 2
Figure 1 - Determination of joint weldability index using combined joint thickness and weldability reference number.
Weldabillity Reference Number
Joint
weldability
index
Combined Thickness T c
= t 1
+ t 2
+ t 3
+ t 4
mm
and over
TECHNICAL
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