Easy question first, can you weld? If the answer to that is no then a cheap welder will not help one bit, it will be frustraiting to use and the results will be poor at best. The wire feed motor will basicly be on or off with not alot of wire speed.
At 130amps its alittle under powdered for the larger plate 3-5mm that you'll need to weld, how ever if you use 'argo sheild' or simular 15-20% argon in Co2instead of just Co2 you'll get better penatration at lower amps. The heavier plate can be 'weld preped' by putting a 2mm 45' on 3mm plate and 3mm camfer around all the edges on 5mm plate and welding completly.
Welding is not just about getting nice pretty lines of steel that lays on the top it needs to have a good root with penetration.
The other thing to bare in mind is that thin gauge steel espesh stuff under 2mm distorts and pulls when it's tacked and welded, you need to know in what order you need to tack it and the seqence you'll need to weld it fully with out it becoming twisted.
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