… chemical attack when accompanied by erosion. Welding instructions: CuMnAlNi is only Weldable on DC + and has an easy removable slag. Use … CuNiAl UNS: C62300, C63000,  C95200 Alloy MNA 13-3 (Cunial A). … E CuMnAlNi … A 5.6: E CuMnNiAl … 17777: E Cu 6338 …