The Forney 45889 DC Aluminarc 4043 is a universal electrode for welding all cast, wrought and extruded aluminum alloyed with copper, silicon and magnesium. With it's exclusive self-lifting slag, it's ideal for loading ramps, diamond plate, door and window frames, engine blocks and much more. Forney DC AlumiArc 4043 will even join dissimilar grades of aluminum! Technique: Remove all contaminates with a stainless steel wire brush and rubbing alcohol. Pre heat heavy sections broadly. Start with high amperage and reduce amperage as welding progresses and base metal absorbs heat. Feed the electrode quickly and move fast. Allow work to cool to room temperature slowly to avoid cracking. Forney Industries is one of America's longest operating family-owned metal working product companies. Founded in 1932, Forney offers more than 5,000 products for the hardware, automotive, farm and ranch and do-it-yourself markets. If you've got metal working questions, we've got answers. We're committed to your success regardless of location size or needs. 4043 aluminum electrode, DC Aluminarc 1/8 inch (3.175 mm) 1/2 pound. Tensile strength 34,000. Recommended amperage 70-120 amps DC, constant current, reverse (+) polarity. Claims for warranty must be made within 90 days of the date of purchase. Proof of purchase required. This warranty does not cover any product that has been subject to misuse, neglect, negligence or accident, or that has been used in any way contrary to the purpose intended.