as to the polarity to use with flux core wire, it’s depends on the manufacturers specifications, but there is absolutely no way that I’d be trying to weld car bodywork and panels with anything other than solid wire/gas shielded:
If the lad is based in the UK, then welding screen(mask) lenses, cover lenses, air filter and prefilter are ALL PPE, and must be supplied by the emplot
Have you access to oxy-acetylene, if so, heat lines opposite (dull red) the the weld that pulled:
The heated area of steel contracts more than it expands, when you first heat it many think it bending the wrong way, as it cools, it pulls back,
I know nothing about this, however, welds with no reinforcement, no shielding of any description, it's all wrong, I would need to see an actual demonstration
Set your welding plant onto its maximum voltage settings, keep the wire speed(wire speed controls amps) as high as it will burn the wire off, descale the plate where it's to be welded, WATCH the root, keep the end of the wire pushing into the root, if the root is burning away/melting then you...
With the porosity in the weld deposit, you need to watch the bead as you're laying it, if/when you see the blow hole appear, step back, stop and fill it and continue as before: as mentioned before, the quality of the material, contamination of the metal will cause welding issues;
The tensile...
Go onto the internet and discover who's your nearest welding supplier, go and talk with them, maybe not the cheapest, but cheaper than Halfords and their ilk:
Working in the shipyards, all the new build plate was sprayed with weldable primer, we didn't have any problems: the biggest issue I've encountered is that people apply it too thickly;
I have an Oxford migmaker, about 2 years old now, in my opinion, it's a brilliant bit of kit, I have no running issues, it's a doddle to set up, I love it!!!
It befuddles my son, he can't seem to get his head 'around' step change
Welding in the rain? Water trapped in the joint, electrodes soaked, gloves soaked, water between the lenses so as you can't see: welding in the rain; Don't do it!
It should feed the wire, supply welding current and open the gas solenoid as the welding torch trigger is pulled, the gas you can both hear, and feel escaping from the end of the shroud/nozzle: if your machine is not doing this I'd believe it not to be working, as it is, it's of no use...
You need not fill the plug completely, weld the lap weld around the hole, and fill it with body filler:
I had to weld shell-plate plug welds at VT Shipbuilding, the slotted holes (2"X 3") were lap/fillet welded but not filled with weld metal, the mass of weld would have created huge distortion...
We have to weld heavy steelwork, 70/80/100mm thick most has been stored outside, supplied by to us by the client, and is in a somewhat poor condition, we are absolutely expected to produce welds with very few (zero) defects;
My employer varied from our normal 'itafill' and purchased a whole...
Unfortunately, welded(?????) by a person who has no knowledge, whatsoever with regard to steel working or welding:
We all know, or at least should know, that before any welding commences, the welding zone shall be cleaned of any contaminants: be this rust, oil, grease, water etc; and the size of...
I'd want to make enquiries as to what grade of steel you should be fabricating these from: some cheap and nasty steel stock may look the business when it's all welded and sprayed, but has the mechanical strength of a packet of jelly babies
I've been coerced at work to take over/learn to use the cat, pug, moggy tractor to weld 8mm fillet on the toe of 10mm flanges over a 7metre length, what I can't prevent is the toe of the flange burning away, I've tried adjusting the volts/amps, the travel speed of the tractor, the angle of the...
It's not a stupid question if you don't know the answer:
Teaching young lads to weld at work has made me realise just how much we 'old timers'(I'm 60) do without thinking, and assume people surely know: I couldn't believe it when my son's friend asked me "what's welding?"