JD knows dual shield. 

hey Martin, good question.  One thing to always check when asked to weld unknown aluminum is if it has any original welds....or is it strictly mechanical fasteners.  That might be difficult on a car frame but since the unweldable alloys like 7075 aluminum are typically stronger than weldable ones, sometimes manufacturers opt for those to save weight.

in the aviation world, if you see a part that only has rivets and no welds, you pretty much know its 2024 or 7075 and you don't weld it. 

There are exceptions to every rule but with lots of technical data stating 7075 and 2024 are not recommended for welding, a welder would be smart to decline those type jobs.

hope this helps,

jody

thanks for the comment, a basic terms video would be a great idea.  land is the tip of the bevel so a zero land would be a sharp edge.  For stick open roots, the land is usually somewhere between 1/16" and 1/8" (1.6mm- 3.2mm).   long arc refers to the length of arc which is distance between tip of electrode and puddle.  rule of thumb for arc length is diameter of electrode or less but sometimes a longer arc is used to warm up the metal while restarting the weld.

hope this helps, 

jody

I should have. I didn't test this lap joint but you should see a 1/4" tee joint in a day or 2 where I did do a cut and etch test and it came out pretty nice...stay tuned. you should see that video very soon.  thanks for the question.

jody

This video shows several overhead restarts

Matthew Chrisman they were not warm from an oven but were from a freshly opened sealed  container. I have used Excalibur quite a bit as well as hobart and others and have never had the intermittent porosity before with any brand whether fresh from oven, or even left out for days. It seems that filler metal in general is sourced due to global supply and economies. I noticed after welding that the country of origin was India.  But the next batch might be China or Turkey.  All I know is that this batch was sub par so I thought it was worth mentioning.

thanks very much for your comment,

Jody

That is a great point.  What brand of variable speed grinder do you like?

I guess there is always an exception. I have heard so many tales of new hires running 7018 downhill on structural steel that I guess I am always on guard and against it in general.

Really enjoyed hanging out with you Matt Hayden,  I will try to get some video when Lee builds the first fire in this rig.

Thanks Martin