This is a very commonly asked question. The application of these two aluminum alloys has such a big overlap that a lot of times it simply comes down to welder preference, cost or availability. When determining which filler alloy to use the most important questions is what is the alloy or alloys you are welding.
We always refer to the table below; it is a great reference chart. Alloy has become the most commonly used of all aluminum filler alloys because of its good strength and its good feed-ability when used as a MIG electrode wire.
It is designed to weld 5xxx series structural alloys and 6xxx series extrusions, basically anything other than castings, because castings are high in silicon. Just because I'm a dumbass don't mean that you can be too.
Originally Posted by zapster. Or is one designed for thicker metal? More tools and junk than i know what to do with! Originally Posted by Fabc8tor. Is there any difference between the two strength wise or anything? A few years ago there were some aluminum parts that we machined for a printing press and they got hard anodized afterwards for the corrosion resistance.
The edges of the parts didn't clean up, so I welded them up and went through the cnc mill again. They looked great. After the anodizing they came back with black bloches everywhere the welds were. Norge Norway. Polska Poland. Republica Moldova Moldova. Slovenija Slovenia. Slovensko Slovakia. Schweiz Switzerland. Suomi Finland. Sverige Sweden. United Kingdom.
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