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I am thinking of converting an old Dialarc ACDC to tig use. The Dialarc HF (Tig) has 3 current ranges, 10 /100 /250 The Dialarc AC DC has only 2 ranges 35-150 and 150-250. My question is for anyone who has converted a stick welder to tig use. Assuming you have a foot amperage control on both units, how important is the lowest range for actual Tig welding, I am not going to be welding any tinfoil, but I would like to use my Dialarc on thin sheet metal, but I acknowledge my welders 35-150 lower range limitation. I assume when I lift my foot off the foot control pedal, I am still going to be passing 35 amps to the work. Anybody out there have any actual experience using an old stick welder with a 30 amp lower range for tig use?
Reply:When you take your foot off the control, there is no current flowing. If you set the current at 100, that is the max you can get when you push the foot control to the floor. Sheet metal does not require high frequecy but on aluminum it does. also at the amps you are going to run, a water cooled torch is not necessary. moore if needed. JohnSMAW,GMAW,FCAW,GTAW,SAW,PAC/PAW/OFCand Shielding Gases. There all here. :
Reply:Ive welded 18-20G stainless with my buzz box tig. Im in the process of making a foot control now, im just waiting for some parts.If you change the input from 220 to 110 you would cut the current down by 1/2. So you could possibly get 15 amps out of it. Only thing is, is that you'll have to connect the fan to 220V or else it wont work.
Reply:Ok Tanky, I think you get what Im talking about. Yeah it seems on this Dialarc, the minimum the control lets you go is 35 amps. That must be the reactor's lower limit... I built an Scr control that goes in line with the 220 V before, is that the foot control your building?
Reply:Yup, heres some pics of the board, I attached the PDF of the schematic I used. Attached ImagesSCRFC.pdf (64.7 KB, 505 views)
Reply:Yeah, thats the one I built a couple years ago, from a design by Mike W. I used it in my Tig welder I built using microwave oven transformers. It isnt the best way to control amperage, but it does control amps down to a very low amount. I used an international rectifier SCR module to substitute for the 2 SCRs. Pictures of my homemade tig welder are in the Hobart forums archives. I think I ll try using 1/2 supply voltage as you talked about .. hook the fan up to the 220, and put a switch on one side of the 120, to act as a lowest range switch. Id like to at least for the time being, stick to the variable reactance control on the Dialarc, cause I heard it works smoother than the SCR control circuit. If I cant get the lower range as I need for lighter materials, Ill go back to the SCR control, which I know will work. I still dont know if the SCR control circuit will give you the full output power of the welder. In case you wondered, the reason I am going over to the Dialarc from my home built MOT welder, is because of my homebuilts lack of power for heavy stuff, I estimate it at about 175 amps. The Dialarc has *** kicking power.
Reply:the only thing is, im not sure if the scr circuit will work with 110V.
Reply:Originally Posted by wiltonYeah, thats the one I built a couple years ago, from a design by Mike W. I used it in my Tig welder I built using microwave oven transformers. Pictures of my homemade tig welder are in the Hobart forums archives.
Reply:Originally Posted by 3 weelin geezerHow to get to the archives? I didn't see a choice in the list for 'archives'. I did a search on your username and only came up with this thread.
Reply:Yes, I highlighted the 'Hobart' forum to look for it and only this thread came up by under 'Wilton'. Say I would like to go to the archives of this forum, is there a link to 'archives' section? That microwave oven tig welder sounds very interesting. Now, if I can only find a microwave that hasn't been shot up in the desert, I would be in business! This is what I see:Last edited by 3 weelin geezer; 10-25-2007 at 02:06 PM.
Reply:hahah no not the hobart forum on this website. This forumhttp://hobartwelders.com/weldtalk/
Reply:Ok Geezer, I used the username Wil, and you might have to go back 2-3 years in the Hobart website. There you will find closeups of my welder useing 8 micro wave oven trans. You might learn a lot just looking at the pics. About how I hooked up the diodes , and R/C filters to keep the diodes from blowing from the High freq. arc starter... better brush up on your basic electricity first before you start fooling with micro. oven transformers and line current. I just used my homebuilt tig the other day, and it works great, but it dosnt have enough power. Tanky Ive already built an SCR controlled 110v small welder using 2 microwave transformers, so I know it will work..
Reply:Hobart website??? Oh, I see now. |
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发表于 2021-9-1 00:06:20