Jump over to the sister forum Woodwork Forums - Powered by vBulletin and look at the Metalwork sub-forums, especially 'welding'. The guys on there have advice on all ranges of need, from the occasional use, such as what you are after, to the professional - and everything in between. Great advice on what to by, how to, tricks & tips, pitfalls etc. The welding link is here: WELDING - Woodwork Forums
Advice from me on this forum is general and for guidance based on information given by the member posing the question. Not to be used in place of professional advice from people appropriately qualified in the relevant field. All structural work must be approved and constructed to the BCA or other relevant standards by suitably licensed persons. The person doing the work and reading my advice accepts responsibility for ensuring the work done accords with the applicable law.