This pic of the casting inside sez volumes--lots of porosity, etc. The machined grooves reveal the same. OP's main problem is not his setup, but the trash part he's expected to 'fix'. I'd be surprised if this part actually maintained high vacuum and if it's really prudent to use such a part in whate...

welding porous al casting -There's porosity in the parent casting, revealed by the groove machining. -Porosity is normal in 'normal' castings and can be more prevalent in the thinner sections. -Castings can be made to a higher level of minimum porosity--at added expense. X-ray of the machined area p...

Ok. I weld on cast aluminum at least once a week, and about every other week or so I come across a very tight spot in a casting that needs to be welded, that requires about a 1 inch long stickout or longer, and they always give me fits. Here is a picture of what I'm talking about. It's always the s...

Sometimes I seem to have a problem with getting HF start to work correctly. It seems to crackle and spark from the whole tungsten and when an arc starts it sometimes comes from the gas lens. I suspect the collet is not making good contact with the electrode but seems to have a firm grip on the tung...

I have the htp 221, so I do have some features at my disposal. I have tried as much as 85%en but man the puddle gets grainy. I would like to stay in the 72-75%en realm. if maybe I had a practical application for the amplitude setting on the machine I could see if using that helps. Anyone use amplit...

Hi Len No offence taken whatsoever. One thing with things like this is that there are so many parameters/options to be listing. So mea culpa for missing them. And thanks for the link to the User Manual. Turns out that my model is the one mentioned on page 32 (Section 5-15) yes to a foot pedal (wire...

Bevel your flats and weld butt joins and mabe finish with outside corner? That's how I would tackle it. A good butt join is just as strong as a fillet! 1-Fit the outside end corners to create a corner weld as (I think) crouchy sez. Beveling both the 45˚angle miter cuts to produce a bevel groove joi...

... I chose to give a fairly detailed rundown on dealing with the problem. From the OP's description--it's obvious that preventing the problem is equally important. Fair enough. I read it as, "What now?" and saw no advice on solving the problem at hand. So he has all your prevention advic...

It just happened, we washed it when we were done with it and the next day it was rusted. We need to get it shipped soon and can't afford to waste time trying all kinds of different things and hoping it works, I was hoping someone here had experience in actually getting it out permanently . Bitch, m...

It just happened, we washed it when we were done with it and the next day it was rusted. We need to get it shipped soon and can't afford to waste time trying all kinds of different things and hoping it works, I was hoping someone here had experience in actually getting it out permanently . Mikey wh...

'I believe it'a an exhaust, I'll talk to the customer. It's not a crack, in the first pic (1347a) you can see the underside of the "patch" sitting in the cutout area. What looks like a crack in the second pic is the gap you can see in the 1st pic. The patch cuts across the inside diameter...

[quote="LtBadd"] My experience tells me if I try this the base metal is going to spit and turn black, any suggestions or ideas are welcome." What is the part? intake? exhaust? There's scant detail in the pics. Some closer detail is needed. Is that a long crack running next to a cutout...

Thanks anyway. Tried everything u mentioned earlier but no luck. Hopefully someone sees this who has worked on or has 1 that can help. 1-determine the actual name/model of the machine (which was already mentioned in prior post) 2-From the above, get the schematic for the machine which will show the...

..... You should be using pure tungsten , so no need to sharpen, just break off the contamination part and start welding. The welding process will round the tungsten to the required shape......ron ......well ron, OP is using an inverter, which performs much better on AL AC with anything but pure tu...

Hello from a new member. I am trying to find more info on the independent amperage upgrade for the dynasty 280. I called my LWS and they said that it was not available. I called Miller directly and they told me it was not available. Any help would be greatly appreciated! Thanks MEMORY CARD,DYN 280D...

I recently bought a Miller 200 Dynasty and started to teach myself how to tig weld. I have been playing around with aluminium and was trying to use the scratch start option ommy machine. Occassionaly I get the tungsten stuck at the beginning of my start. When this happens do I need to resharpen my ...

Coming along well. I'm taking some time to dial this in before I really start production so as to avoid the SNAFU possibility. -REV I'm confused. What are these frames 7' x 12' for? They have no gusseting or inner bracing? You're fixated on corners being square, but for fit and function-what's the ...

....and a quick google search sez 'free machining'; which normally implies 'not weldable' due to
sulfur or lead added for machinability......kinda of red flag
and gives equivalent of US 1140

......and the joint is butt, T, lap, or ???

I checked out the factory parameters, and came across the fact that: with a 3/32 tungsten, in AC mode, the welder starts the arc in EP at 120 amps . This seemed excessive, so I started playing around with the start parameters in "GEN" mode. After fiddling with that for a bit, I set the we...

Check out my post below on welding .065 inch 16 gauge mild steel tube.. The Pulse settings that Brian recommended really helped me... Also remember 18 gauge is half the thickness of 16 gauge you need to use .035 inch or .040 inch filler rod and a 1/16 inch tungsten max....if you don't want to worp ...

How much indicated runout is on that shaft, to the end?

Breaking off the tungsten end with pliers/dykes, etc.; prior to point grinding, is a great way to induce
tight fracturing down the length. Grinding off the used end with cutoff wheel, etc. doesn't do that.

appreciate of the input. the frame is mild steel. I've read pre heating the chrome-moly tube over a certain thickness is important, too. ***preheat on much thicker sections, not on tube assemblies All the tubing braces were both sanded and wiped down with toluene inside and out. The frame that I wa...

So to fix the blow out in the first pic...are you drilling back through that spot and then filling it back in with the Tig once everything has cooled off to see if the outgassing quits giving you trouble closing the hole? Grind, bur all that porosity out and feather. Simply drilling isn't going to ...