[Government welder]

So we built this ladder for diving and noticed that when finishing a weld on the rungs we go black spot and it would not wet it. We ground out drill out still never fixed anything.we cleaned the parts with flapper and acetone. Machine is dynasty 800 argon was set on 18 #8 cup 1/16 gray tunston 1/16 filler machine was on 135 amps. Material was 1 1/4 s h 40 aluminum pipe and 1x2 tube both 6061. We didn't clean the inside of any of the material as we didn't have anything that would get all the may inside. Any thoughts

[BillE.Dee]

nice ladder. Is the problem with all of the rungs or just a few? Can you zoom in on one of the problem spots and get a picture?

[Government welder]

The ladder is at work let me see what I can do on pic it was not on everyone one but pretty close

[sinisterbiker]

So we built this ladder for diving and noticed that when finishing a weld on the rungs we go black spot and it would not wet it. We ground out drill out still never fixed anything.we cleaned the parts with flapper and acetone. Machine is dynasty 800 argon was set on 18 #8 cup 1/16 gray tunston 1/16 filler machine was on 135 amps. Material was 1 1/4 s h 40 aluminum pipe and 1x2 tube both 6061. We didn't clean the inside of any of the material as we didn't have anything that would get all the may inside. Any thoughts

Drill a small hole in the rungs to let the hot air pressure to escape before final welding, and then just fill it after they cool a bit

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[Government welder]

This was after I ground it back down to be do it I guess I forgot to get picture of the actual problem

[tweake]

So we built this ladder for diving and noticed that when finishing a weld on the rungs we go black spot and it would not wet it. We ground out drill out still never fixed anything.we cleaned the parts with flapper and acetone. Machine is dynasty 800 argon was set on 18 #8 cup 1/16 gray tunston 1/16 filler machine was on 135 amps. Material was 1 1/4 s h 40 aluminum pipe and 1x2 tube both 6061. We didn't clean the inside of any of the material as we didn't have anything that would get all the may inside. Any thoughts

0.140" and .125" wall ???

if so 135 amps sounds way to cold. even in the pic it looks really cold.
i would be doing a test piece and checking penetration on that.
with those thicknesses i would be up in the 150 amp range (probably start 170 and then back off), 3/32 tungsten, 5 or 6 cup.

[Government welder]

Wall thickness of pipe is .140 and tube is.125. I'm still pretty green at knowing how many amps I need for tigging. I can't wait til it just comes natural.

[tweake]

Wall thickness of pipe is .140 and tube is.125. I'm still pretty green at knowing how many amps I need for tigging. I can't wait til it just comes natural.

plenty of calcs that will get you in the ball park.
but a dirty trick that can help is to simply cover the amp settings numbers. that forces you to focus on the puddle and adjust to suit. usually you have a good idea when tacking. you want a puddle formed in a few seconds.
pretty common with foot peddle as you have no idea what actual amps your running.

what compounds things is joint configuration plus differences in sizes, but also material differences.
the square tube being welded on the end requires a lot less heat than the round pipe. which is probably why it looks fine on the tube but cold on the pipe. looks like it needs more amps and more focus on the pipe side of things.
keep in mind thats only going by one pic, it may look different in real life.

i welded in a 3/8 wall fitting into 1/8 sheet (different unknown grades), but for some reason the 3/8 wall fitting was melting just as well as the 1/8 plate. i have no idea why.
read that puddle, adjust to suit.

[BillE.Dee]

hello G man .. it looks a little cold on the weld. I'd turn the amps up a bit more and work the heat with the foot pedal once you get a puddle going. you'll need to focus on the thicker part a bit more than the thinner one. You didn't state where the balance is set or the freq is set. When you clean the heck out of the material, you don't really need a lot of cleaning (balance) from what I've seen anyway. Also, the lower the freq, the wider the arc will be and you can catch both parts with a wider arc a little easier and you will be putting more heat in the joint. With the larger cup , you can have more stick out and get into the joint a little tighter.

[Government welder]

105 freq and 73 cleaning I really appreciate all yalls knowledge and thankful of the friendly pointers.