Structural aluminum is usually welded with 5356. Cast aluminum is usually welded with 4043. For non critical applications these two wires are often interchangeable. There are some other less popular grades of welding wire for specific applications but if you can't decide between 4043 and 5356, get some of the new Maxal 4943 wire. It's the cat's azz according to a guy I know who specializes in aluminum welding. Wets out better than 4043 and basically welds like 4043 with the higher strength of 5356. Check the specs. to see if it is recommended for 5000 series aluminum.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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