- Thread starter zardoz
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Lewis Medlock
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How am I being silly? Please elaborate. Are you saying you can't spray overhead, or that spray doesn't give better penetration than dip?
I'm not saying either. It's horses for courses, dip and spray have their place but to say you always need to be in spray transfer and that dip transfer doesn't penetrate enough are very broad sweeping statements that are incorrect and may confuse people.
I imagine you will use spray transfer for your 30mm plate, not because dip transfer won't penetrate (because it will with the right prep), but because it would take a lot more time to perform the same weld and therefore a far less efficient way of working.
If i make a pair of gates out of box section with a 2mm wall thickness do I also need to be in spray transfer? Of course not, and I'd spend most of my day changing rollers, tips and wire to make sure I was always in spray transfer when working with materials of different thickness.
The OP was looking for advice on an overhead MIG butt. The chances are this will be in Material of less than 10mm and if thick enough will include a single Vee prep, the chances are that the employer will be looking for the candidate to root fill and cap. My advice was based on that assumption.
Jim
chunkolini
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Zardoz, have you tried doing it standing on your head?
matt1978
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Whether to be in Spray or Dip will be decided by the material thickness and thus which Voltage required to burn off the wire and of course the wire diameter.
If its over head welding for an open Butt weld the root would most probably be done in Dip but could also be Spray for the fill and cap.
But if it was a T-Fillet or Lap Joint of quite thick material then it would probably be spray.
If its over head welding for an open Butt weld the root would most probably be done in Dip but could also be Spray for the fill and cap.
But if it was a T-Fillet or Lap Joint of quite thick material then it would probably be spray.
Electric Glue
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I didn't say you always need to be in spray transfer. The only incorrect statement made was to say that you had to use dip for overhead and I didn't say that either. You and Mad Mick did.
Who mentioned gates? Who mentioned 2mm? Why would you need to overhead when you were welding them? I never said anything about always being in spray transfer....
The OP said he has no idea what to expect. If the employer is working with heavy stuff he will probably expect him to be spraying. Might have been an idea not to confuse the lad and tell him what settings to use given you'd got no idea of the material either.
As to root, fill and cap on a 10mm butt...
Electric Glue
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Has pulsed spray transfer been confused with ordinary spray transfer in this thread?
No I don't think so. It's not hard to tell the difference lets be honest.
Lewis Medlock
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Yes you did.
I gave advice in good faith which incidently would serve the OP well whatever material thickness he was presented with for his test. Granted if he was given a hefty piece of plate it would take a while to prep and weld.
You on the other hand have offered him no advice and seem intent on picking an arguement based on a very narrow point.
You sound like a "GoodWelder" and we're going round in circles so I'll leave you to it.
All the best, Jim
chunkolini
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This seems to be turning into a debate; rather than an attempt to assist Zardoz with his forthcoming welding test.
All this extra information floating around cant be much help to him, in fact is probably quite intimidating.
All this extra information floating around cant be much help to him, in fact is probably quite intimidating.
Electric Glue
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How can you accuse me of trying to start an argument when your reply to me was "don't be silly"?
You never did tell me what I was being "silly" about. You just went waffling on about gates and 2mm box section!
If you go back to my OP you'll see that I was merely trying to protect the lad from bad advice. You know, the kind of "goodwelder" who will start throwing voltage and wire speed figures out like he's quoting physics formulae and who knows everything there is to know about welding having made a trailer for his mate and a set of gates for his neighbour.
I wasn't trying to pick an argument, merely to pass on a bit of genuine knowledge and stop the lad getting closed-minded advice. Sorry if I stepped on any "expert" toes, you'll have to forgive me I've only been internet welding for a couple of days and the skill level is much, much higher than I've come across in real life.
Drains
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Serious question - and I'm not asking for anybody to start giving anyone a hard time, but how do you do spray overhead on solid wire? I've never successfully done spray on anything other than downhand.
So I'm looking for an idea of volts, amps (maybe), wire feed speed and technique. Ta.
So I'm looking for an idea of volts, amps (maybe), wire feed speed and technique. Ta.
Electric Glue
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Can we agree to disagree and knock this on the head please?
Fair enough. Just didn't like the "don't be silly" comment.
Sorry for clogging up the thread
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Fair enough. Just didn't like the "don't be silly" comment.
Sorry for clogging up the thread
Neither did I!
If you disagree with someone's advice then say why you disagree, comments like that help nobody.
Electric Glue
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If I'm honest, I've never taken a great deal of notice of settings. In my experience they don't transfer too well between machines anyway other than to give a rough idea. (I'm back at work tomorrow so I'll try and remember to make a note)
The simple answer would be to use pulse. Not everywhere has it though and it can be done without, you just need good control. Start off with a low end spray setting and back the wire feed off slightly more than usual. Angle back a bit more than downhand. I use a slight back weave to gouge in to the land and then backfill (don't go daft though or you won't get the penetration in the leg/groove)
Let me know how you get on.
