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To get proper penetration in root welding,7016, or 8016, (as per the WPS or client requirements) electrodes are normally using for API 650 storage tanks. These electrodes must use in straight polarity (-) to get a better penetration comparatively less slag and an excellent mechanical properties. then for the fillup and cap 7018 or 8018 are the electrodes what we are normally using this must be in reverse polarity (+) for a stable arc.
