Mig 5356 FAQs
Straight answers on choosing, feeding, storing and troubleshooting 5356 (aluminium-magnesium) MIG wire.
Can I use 5356 wire on parts that run hot?
Not for sustained heat. Aluminium filler with more than about 3 percent magnesium can become prone to stress corrosion cracking if it is held above roughly 65 degrees C (150 degrees F) for long periods, and 5356 sits above that magnesium level. Other high-magnesium fillers share the same limit.
For parts in warm service, such as near engines or exhausts, consider a lower-magnesium or aluminium-silicon filler, or ask the designer. The limit applies together with other conditions such as a corrosive environment, so it is a design question, not a rule of thumb for every job.
What shielding gas and technique suit aluminium MIG wire?
Pure argon is the usual shielding gas for aluminium MIG. Argon-helium mixes are used when more heat is needed on thicker material, but they depend on your power source and the job.
Push the torch (point the arc away from the finished weld) rather than dragging it. Pushing keeps the gas in front of the pool and helps clean the oxide, and dragging tends to give more porosity. Use the electrode-positive (DC+) setting that the wire and machine instructions give, and a settled gas flow without draughts.
Why does my aluminium wire tangle or stop feeding, and how do I prevent it?
Aluminium wire is soft, so it crushes and buckles in a feed path built for steel. The usual remedies are U-groove drive rolls with light pressure, a smooth plastic (such as PTFE) liner instead of a steel one, a clean, correctly sized contact tip made for aluminium, and a short, straight cable.
If the feed path is long, a push-pull torch or a spool gun, which keeps the wire path short, often cures it. If the wire still tangles, check the liner, the tip bore and the roll pressure before changing the machine settings.
How should I store a reel of 5356 wire?
Keep the reel in its sealed original packaging until you need it and store it somewhere dry and at an even temperature. Aluminium wire picks up moisture easily, and moisture on the surface is a leading cause of porosity in the weld.
Once on the machine, keep the reel covered and put unused wire back into its bag. If a cold reel is brought into a warm, humid workshop, let it warm up before opening it so that condensation does not form. Handle the wire with clean gloves.