You have to weld in a ' stitching progression ' from the cente outwards so that the heat input is distributed evenly and slowly,
you need to weld 50 - 100 mm then stop then move 100 mm and weld another 100 mm, from the centre outwards,
you then return to where you started and complete the rest of the un welded areas
this will prevent the shrinkage,
Nick Davies
On Wed, Aug 19, 2009 at 3:25 PM, Mrityunjay Kumar / ZS Saudi PEB QA/QC <Mrityunjaykumar@zamilsteel.com> wrote:
Dear all,
We have encountered that the material (8 mm plates from ASTM 572 Gr-50, Type-1) is shrinking along to the length while doing double side welding at flange of the crane beam.
Anyone can explain the reasons of above problem.
Thanks and Regards,
M.K.Choudhary
PEB - QA/QC
P.O. Box 877, Dammam 31421
Kingdom of Saudi Arabia
' +966 38471840 Ext- 555
7 +966 38471840 Ext-559
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