WELDING AND DP TESTING Sample Clauses

WELDING AND DP TESTING. The scope of work for weld joints includes all operations associated with making each joint, including cleaning, marking-out, cutting, profiling, bevelling, grinding, aligning, fitting-up, tack welding, cleaning, chipping, pre-heating (if necessary), placement of wind xxxxxxx, weather protection, necessary scaffolding if any and final welding together with final cleaning of welds, post-heating and DP testing. The choice, grade and make of the welding electrodes and filler wires shall got approved by the Quality division of the Department. After tack-welding, the alignment of the fit-up shall got approved by Quality division of the Department before proceeding with final welding. DP testing shall be carried out for the root and final passes of the welding in the presence of Quality division of the Department. Welding rods, filler wires, argon purging gas and chemicals required for DP testing, Acetone cleaner, SS wire brush, dye, developer, etc shall be brought by the contractor and be included under this item. For the longitudinal (L-seam) welds, the length of welds shall be measured in mm and will be divided by a factor of 105 for converting the length to “Inch Dia”. 5.1.1 STAINLESS STEEL BUTT WELDING The welding shall be carried out by gas-purged Tungsten Arc Welding (GTAW/TIG) process with Argon gas (purity 99.99%) purging both inside and on the weld zone in outside of the pipe. The following welding is typical, but not limited to the work covered by this item: a. Pipe to butt weld fittings and flow components b. Butt weld fittings to butt weld fittings and flow components c. Pipe to pipe and half sleeves of pipes 5.1.2 STAINLESS STEEL SOCKET WELDING The welding shall be performed by (GTAW/TIG) process with Argon gas purging on the weld zone in outside surface of pipe. This welding involves, but not limited to welding of straight pipe to socket weld fittings, valves and half sleeves of pipes.
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