Welding of Bisplate General Information
All grades of Bisplate can be readily welded using any of the conventional low hydrogen welding processes. Their low carbon content and carefully balanced, but relatively small additions of alloying elements (Mn, Cr, Mo, Ni, B) ensures good weldability, in addition to the advantages of high strength, impact toughness and high hardness.
STEEL COMPOSITION Bisplate grades and chemical compositions may be divided into categories based on Carbon Equivalent and Pcm, as follows: Recommended Preheat/Interpass Temperatures (0C) for Bisplate WELDING CONSUMABLES Welding Consumable Selection Guide for Bisplate (AWS Classifications) Welding Consumables for Manual Metal Arc Welding (MMAW) Welding Consumables for Gas Metal Arc Welding (GMAW) Welding Consumables for Flux Cored Arc Welding (FCAW) Welding Consumables for Submerged Arc Welding (SAW) TACK WELDING Tack welds require special care due to the abnormal stresses and high cooling rates experienced by the adjacent material. The same preheat, heat input requirements should be employed and lower strength welding consumables considered. STRESS RELIEF Stress relief may be conducted on Bisplate 60, 70 and 80 structural grades but is advisable only if absolutely necessary (eg. to comply with AS1210 in the case of road tankers). Stress relief is recommended within a 540 - 5700C temperature range for one hour per 25mm of thickness. Thermal cycling is generally performed in accordance with AS1210-1989 Code. For information on welding Bisplate please refer to the Complete Technical Manual. |
