wiring an arc welder in to fuse board

[decepticon]

its not that easy to explain but its not just about how thick a piece of metal is for how strong a weld needs to be. its quite easy to weld a 20mm base plate to a 100mm box section with a 4mm fillet weld, that would give a 400mm run of 4mm fillet weld which would require a force of approx 280kn or 28 tonnes to pull the plate off. this would be very easy to lay down with a 3.2mm rod at 100-120amps
welding is as mentioned ridiculously strong.
i always say it is better to have a machine which is bigger than needed so you are future proofed and not over stretching your equipment but dont fool yourself that you need 200amp machine if you dont need it or will never use it.
cheers
neil

 

[wilfatron]

its not that easy to explain but its not just about how thick a piece of metal is for how strong a weld needs to be. its quite easy to weld a 20mm base plate to a 100mm box section with a 4mm fillet weld, that would give a 400mm run of 4mm fillet weld which would require a force of approx 280kn or 28 tonnes to pull the plate off. this would be very easy to lay down with a 3.2mm rod at 100-120amps
welding is as mentioned ridiculously strong.
i always say it is better to have a machine which is bigger than needed so you are future proofed and not over stretching your equipment but dont fool yourself that you need 200amp machine if you dont need it or will never use it.
cheers
neil

i see what you mean that is ridiculously strong,do you think something like this
http://sip-group.com/acatalog/05012.html would be suitable? i will be able to run it from a domestic socket too

 

[decepticon]

would probably be more than sufficient given the minimal background info we have, dont expect to be able to realistically burn 4mm rods though (not that you would probably need to)
duty cycle is what counts when you are comparing machines, 140amps at 35% means you can run at 140amps for 3mins out of 10 before you need to let the machine cool
it could be run on 13amp supply to run a 3.2mm electrode