Mr. Kannan,
Few more explanations are required. U have not mentioned the size of the electrode (or) current selection for that size, position, depth of
the defect, type of joint, position of welding etc.
Since it is thick base, we assume, U have used 3.20/4.00 electrode with appropriate current as recommended by the manufactures. The type
electrode, whether it is E 7018 B2L or E 8018 B2L do not make any difference and nothing to do with your L F problem.. Use 3.2 initially and then
4.0 mm for full fusion.
Repair welding is a specialty unlike normal joint welding. Apart from preheating, grinding the defective area, use of some excessive (5 % or so)
current, grinding the initial repair weld, checking with DP if required are all important.
Repair welding requires a separate procedure update. Fill up at edges to get good fusion. If required, the initial pass and full repair welding
could be carried out with TIG also as each bead below the next run gets normalized /tempered and forming fine grain structure. But the choice
is yours.
Hence grind the repair area to provide free flow of weld metal. Check the current and weld layer by layer, cross checking in between .
I am sure the repair welding will come out well to pass the x-ray Test.
Sridhar.
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From: sudalai kannan <sudalaims@gmail.com> |
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