LANLEngineering Standards Manual ISD 341-2 Chapter 13, Welding & Joining Section WFP 2-01 Welding Fabrication Procedure Rev. 1, 10/27/06 Attachment 3, ASME B31.8, Gas Transmission & Distribution Piping Alignment and Acceptance Criteria 1.6 In assembly of socket weld joints, the pipe or tube shall be withdrawn a distance of approximately 1/ Assuring the Integrity of Air-cooled Heat Exchanger Tube tube end joint required is a seal weld. This creates problems during welding as a tubesheet of this thickness acts as a heat sink causing the welded steel to cool very quickly, dramatically increasing the final hardness of the weld. Cracks in individual tubes are reasonably common, and the action taken is to plug the tube
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