Picture links don't work for me?
Since I can't see what the problem is, I'll
speculate based upon your description:
IF you are trying to weld the 2 pieces together in a "T" joint, then getting your tungsten close enough to the intersection can be difficult, and you are creating too long an arc. This can cause your filler rod to melt before it gets to the puddle, create too much heat in the surrounding area and disrupt the weld bead, and cause the puddle to "wander".
(Do this without power). The best trick I can offer for this effort is to lay the cup directly on the flat plate. Rotate your cup towards the seam, and slightly ahead. See if the tungsten will touch the metal? If so, reduce the amount of stickout. If not, increase the amount of stickout until the tungsten is the same distance from the metal as the diameter of the filler rod your using. Then, rotate the cup ever-so-slightly more "ahead". This will have you pushing the puddle, and you will be able to see the arc, the leading edge of the puddle, and control the filler as you add it.
Dab, move, pause, dab, move, pause, dab. Pausing when you add filler helps you prevent the tungsten from touching the puddle and keeps you more organized until you achieve the fine motor skill to walk, talk, chew gum, discuss politics, and comb your hair at the same. Or TIG weld. Same things.
In general: If you can rest your torch hand and the torch on a stable surface and slide along you will get better results. Same is true for your filler rod hand. Get comfortable, get stable, and move slowly and steadily. (Check your links too so if others are having the same problem, we can see and better help).
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