I have a little 220 Lincoln Mig welder its like right around 65 pounds in weight. When looking for a welder the main thing you want to look for is the "Duty Cycle" that tells you how much your welder is really working for you. The Harbor Freght ones are good but look at the duty cycle. Also 110 units are nice but for thin metal. I got my 220 unit cause I didn't want to be limited to what i could weld. Do some research first before you buy anything. Try
www.lincolnelectric.com. I was lucky I paid $180. for my welder from a friend. There are good deals out there but real pay attention to the duty cycle. Remeber you get what you pay for. Feel free to e-mail me. I have a big welding background.