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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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Jon Danniken
For your question regarding TIG welding, I would say that if you can
replicate capabilities of a Syncrowave 250 DX, you would do very well. Miller has the specs and manual available online. -- Due to extreme spam originating from Google Groups, and their inattention to spammers, I and many others block all articles originating from Google Groups. If you want your postings to be seen by more readers you will need to find a different means of posting on Usenet. http://improve-usenet.org/ |
#2
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Jon Danniken
"Ignoramus8187" wrote:
For your question regarding TIG welding, I would say that if you can replicate capabilities of a Syncrowave 250 DX, you would do very well. Miller has the specs and manual available online. Thanks for that, Iggy. That manual has some good expalations of the TIG process, as well as the schematic, which is very informative for me. The schematic, however, is bringing up a question in my head. For DC usage, it is pretty straight forward; xfmr, SCR bridge, smoothing choke, and that's about it. For AC, however, they are doing something I haven't come across before. (here is the relevent section; work is green, electrode is RED, and blue is the (+) and (-) output from the SCR bridge: http://home.comcast.net/~danniken/Sy...DX_Page_60.png if it wraps: http://tinyurl.com/48bzgn Now, the work goes back to the transformer, no surprises there, but the electrode does something odd. It goes to the part of the bridge where AC normally goes, and the DC outputs of the bridge are connected through the smoothing choke! What the heck? They also have this going to the DC output from a diode bridge, SR2 in the schematic. Now, I haven't seen this topology before, but in the absence of a later inverter, I have to assume they are using the SCR bridge (and possibly the diode bridge) to modulate the AC waveform somehow. Any ideas what this is doing, or even what it is called? Maybe they are doing this to avoid having to have a transistor/mosfet inverter after the rectifier, I dunno. Sure is compelling, though. Thanks again, Jon |
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