| Dear Sujit Kumar, SA 516 Gr. 70 is a low carbon fine-grain steel suitable for low temp. service. Heat input to be controlled to get good impact properties. The HAZ is roughly divided into three sections. 1. The section adjacent to the weld shows a dendritic microstructure made of large pearlitic grains on a ferritic fund. 2. The section in the middle shows a ferritic and pearlitic assorted grains of a similar size. 3. The section apart from the weld shows ferritic and pearlitic grains on a fund of larger ferritic grains. 4. The base metal, not affected by heat, remains the same, i.e. assorted pearlite and ferrite grains. SA 516 Gr, 70 is easy to weld using SMAW & GMAW if it is a plate. You can avoid using the GTAW process and this process is generally recommended for root welding of CS, AS, and SS pipes and full welding of SS, AL, CU, Ni, etc. SMAW/GMAW/FCAW follows GTAW to economise the welding, where ever applicable or you can use SMAW all the way up to cap pass or SMAW followed by SAW/ GMAW/ FCAW if the material thickness is 20-25 mm and above or for higher volume production. Towards, consumable recommendation: ER 70S-2 (with triple de-oxidizers) for GTAW root application and E 7018 for filler & cap passes (or) E 7018 / E7016 for root, filler and cap passes. ER 70S-6 for GMAW, E 71T-1 (or) E 70T-5 for FCAW and EL8 / EM12K for SAW processes. Pre-heating to 100-1500C and inter pass temp. are recommended for thickness above 20 mm. Sridhar. |
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