View Full Version : Welding 5-8mm steel box-section tubes

09-05-2015, 03:26 PM
I have no welding experience yet, but intend to learn.
Ultimately, when I've done some small projects for experience, I want to put together a gantry-type cnc router... Probably with 5mm thick box section tubes.
I have no welder, and there seems to be a load of choice/advice on whether to use mig/tig/arc.
I have no welder rig yet, need to get one. What do you folks recommend ?

09-05-2015, 04:59 PM
I have all types of welding gear gas oxy/acy arc welder mig and tig

but for a starter set get a mig 160-180 amp and a rent free large bottle
you should be able to get that for 100-200 and 100 for the bottle or rent one from boc if you think you may only want it for the one project.. or you dont mind paying 40 a year for ever
This will do all you want with mild steel and be nice and easy for you to learn with
Dont think about gas free sets or using the small disposable bottles.
and if you can get a set with a euro torch though that may be difficult at 200 budget

My 2p worth


09-05-2015, 07:01 PM
or buy a 50 quid stick/arc welder and a box of 2.5mm rods. and your welding, plenty of stick welding vids on youtube to get you started

Boyan Silyavski
11-05-2015, 09:32 AM
I welded half of my first frame using DC stick welder, i agree, pretty easy to learn watching you tube videos. Plus you can grind and cover the sh*t when painting so at the end you will finish with pretty frame.

Bought a proper MIG then- 250A (http://www.ebay.co.uk/itm/Schweisgerat-250A-IGBT-MIG-MAG-MMA-230V-GRATIS-BINZEL-ESAB-/221765062564?pt=LH_DefaultDomain_77&hash=item33a23a4fa4)and changed the Chinese gun with bran new Wurth 250A gun, which is re-branded Binzel gun. Obtained from a boot sale for say 50 euro but similar could be obtained for 150euro new on ebay.

Wow, thats a monster combination for a serious manufacturing. Welds 10mm stuff like butter and it has never stopped due to duty cycle limitation, i believe it was something like 100% on 200A

Its good for aluminum also, due to the high amperage plus you will have the second gun for aluminum, when you upgrade one day the one that comes with the unit, which is short by the way, you really will need something like 4m gun hose. The unit on the link is exactly like mine though rebranded.

11-05-2015, 10:43 PM
Hobbyweld do a rent-free tri-gas bottle for 60 plus about 30 for the gas.