How to Weld Magnesium with TIG
What you will learn in this episode:
In this episode of TIG Time we look at how to weld Magnesium. We have recently received many requests to do a video on this for a few reasons. One mistake many people make, when welding Magnesium, is that they think, "Because it is AC, it must be just like welding Aluminum". This is not true and we will show you some of the differences. Also, Magnesium is pyroforic, which means it can catch on fire if you do not use the correct process; in this case, TIG Welding.
This project calls for some prep before we are ready to make the final repair. As you can see, the casting has a crack on one of the ears (seen to the right). Before we start welding, we need to groove out each side of this crack so that we remove the oxide layer. We are now preped and ready to weld.
One question that we've been getting a lot is, "What filler material should I use and where can I find it?" A good filler that works well as an "all purpose" filler is called AZ92A. However, this particular filler can be very expensive (up to $120 per pound) and often times you don't need a full pound. If you are looking for this filler in half pound increments, you can find it at TIG Depot.
Often times welding Magnesium is compared to Aluminum. In some ways it is similar (It's welded on AC so you get cleaning action), but in many ways it can be very different. You will notice that that arc tends to be less stable when welding Magnesium. You will also see that when we welded this piece, we started on the inside and then moved to the outside. Anytime you can weld from both sides it will help with distortion.
Power Source - Lincoln Electric V205-T
Helmet - Lincoln Electric Viking 1840
Gloves - TorchWear TIG/MIG Welding Gloves
Welding Sleeves - Torch Wear X-Sleeves
Torch - CK WorldWide 9F