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CP changes address hydrogen diffusion

09/22/2008
Adjustments to a pipeline’s cathodic-protection program can help address possible hydrogen diffusion brought about by nonconformance with welding procedure specifications (WPS) during construction.Low-hydrogen welding processes like gas metal arc welding (GMAW), flux-cored arc welding (FCAW), or where necessary selection of low-hydrogen shielded metal arc welding (SMAW) consumables are required for joining high-strength steel pipeline material, particularly if the structure is also protected by cathodic protection.Deep-digging arc characteristics of cellulose-coated electrodes allow better weld metal penetration and arc control in varying welding positions as compared with other ava...
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