Tig Technique Help

Need a little help from Tig users. When doing a fillet weld I normally feed the filler rod into the leading edge of the puddle and can get good results. My question is when doing a fillet weld into an inside corner ( like welding the inside of a box) what is the technique for getting the weld all the way into the corner and still being able to feed the rod into the puddle. I seem to foul the tungsten and end up with a mess in the corner where several beads will join together. Any tips or advise sure would be welcomed. Thanks.

 

The first and simplest is to weld a corner on the outside. When I used to build aluminum extrusion with corner cut on a 45, we could do a beautiful fusion weld running from the bottom to the top. Fitment was important. The weld is prettier than a raw cut.
Inside welds are difficult because the gas is bouncing back and you would have to run the tungsten out further and maybe sharpen the electrode. It ain't easy inside for sure.

 

Stick tungsten out, always sharpen tungsten, slow down just a little, watch the puddle start to flow, and use a horse shoe pattern...

 

When doing a hard to reach spot ie. tubes or brackets joining at a steep angle, sticking the tungsten out further to reach is ok. Normally you can't do this as you lose gas shield, but in this case the area being welded acts as a back stop to keep the gas from getting away..works for me. Shorter, smaller cups with a gas lense will help too if you aren't using one.