MasterWeld A33 (ER90S-B3) is a copper coated low alloy steel TIG welding wire for welding 2 1/4% chromium and 1% molybdenum steels in high temperature service applications such as pressure vessels or piping.
May also be used on carbon steels to Cr-Mo steels but should always have careful control of preheat, inter-pass and post-heat to avoid cracking. Use with a pre-heat and inter-pass temperature of 375°f minimum.
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A33 (ER90S-B3) TIG Welding Rod
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