Strain-based pipeline design assumes that the pipeline may experience significant plastic strain during installation or while in service. In order to avoid localization of this plasticity within the weld deposit, which could result in plastic collapse, consumables are selected to achieve a so-called “overmatching” condition between the weld metal and the adjacent base metal. This is intended to produce a more favorable distribution of plastic strain across the weld joint.
--Robert
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of manpreet
Sent: Tuesday, February 01, 2011 4:36 AM
To: materials-welding
Subject: [MW:9643] Consumable for High strain Pipeline welding
Dear All,
Can somebody define High strain Pipeline Welding and why does it require much higher strength consumable than the base metal strength? For welding API 5L X60, Root pass is welded with E9016G, also why does it require Uphill progression? please provide your valuable inputs.
Regards
Manpreet Singh
--
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