240v outlet for welder- is there a standard?

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I am putting in a circuit for my soon to be welder. I am not sure yet on type or size, but an upper limit of around 220 amps .  I am running #6 thnn type wire in 3/4" conduit with a 50 amp breaker.  Is there a universal plug for 240v welders in the 100-200amp range, or does every company use something different?  Should I just put in a 4" square box and wait till I get a welder to put in a receptacle?  The only receptacle  I am familiar with is the nema 6-50-R found on the Lincoln tombstones.
Reply:My Dynasty came without a connector. I put on what I use for all my other 240V things in the shop. I use all 4 wire connectors which would definitely NOT be the standard.
Reply:I don't ever remember buying a welder that came with a plug. I use these, never any problems. You can buy them at Ace Hardware, or Lowes. Attached ImagesDon’t pay any attention to meI’m just a hobbyist!CarlDynasty 300V350-Pro w/pulseSG Spool gun1937 IdealArc-300PowerArc 200ST3 SA-200sVantage 400
Reply:My miller 252 and precision tig both came with nema 6-50 plugs
Reply:NEMA 6-50 is what I have on my welders 50A 250V rating
Reply:NEMA 6-50 is the most common if anything.GravelThe difference between theory and practice is that in theory there is no difference.
Reply:Originally Posted by sparknessNEMA 6-50 is what I have on my welders 50A 250V rating
Reply:My Thunderbolt came with a 6-50P plug.  Those seem to be fairly common for 240 VAC.  Sorry, was interrupted by a looooong phone call and see others have beat me.  So, here's one more vote for 6-50......Tim
Reply:Just did some looking through spec's on the thermal arc and miller sites and it seems a 6-50 is the receptacle to have.  Thank you all!
Reply:Originally Posted by CEPI don't ever remember buying a welder that came with a plug. I use these, never any problems. You can buy them at Ace Hardware, or Lowes.
Reply:I generally use what CEP and Madwelder use because it's always available at the big box and hardware store, but you're better off staying with the Nema 6-50.  As I've acquired more equipment over the years, many have come with a molded Nema 6-50 attached.  This has led me to make a few adapter and finally a 3 outlet female extension cord.  My cord is male 3 prong CEP type with 1 female of the same and 2 Nema 6-50 outlets on the female side (3 females fit in a 4 gang box perfectly).  I can keep my plasma mig and stick welder all plugged in at the same time that way.TA Arcmaster 300CM3XMT 304S22P12 suitcase feederX-Treme 12VSOptima pulserTA161SMaxstar 150STLHypertherm PM45OP setupStihl 020AVP, 039, 066 Magnum
Reply:My 1952 vintage Lincwelder AC180C has a molded-on 10-50 range plug."USMCPOP" First-born son: KIA  Iraq 1/26/05Syncrowave 250 w/ Coolmate 3Dialarc 250, Idealarc 250SP-175 +Firepower TIG 160S (gave the TA 161 STL to the son)Lincwelder AC180C (1952)Victor & Smith O/A torchesMiller spot welder
Reply:I have added a 220v receptacle to all my machines, except for the plasma cutter. I figure I can only use one machine at a time so why not?The picture I posted is the back of my stick welder, you can see the range cord going in to the junction box next to a 10-50r on the back.old Miller spectrum 625 Lincoln SP-135 T, CO2+0.025 wireMiller model 250 and WP-18V torchCraftsman 100amp AC/DC and WP-17V torchCentury 115-004 HF arc stabilizerHome made 4 transformer spot welderHome made alternator welder
Reply:Originally Posted by mad welder 45 you can use L to N power on your welder for an additional fan or light (on 6-50 that's not technically code)
Reply:I've a mishmash of 10-50R and 6-50R's that I plug into so I keep both on hand and rewire.