It is possible without a welder - I dont have one and I reckon I could get away without one for making a lifting arm.

I was looking on eBay also for welders, but I found the weight of them bumps up the price considerably; so Im looking at Machine Mart at the moment for them - they appear to have a good range for reasonable prices:

http://www.machinemart.co.uk/product_105_welders_accessories/index.asphttp://www.machinemart.co.uk/product...ries/index.asp