I am looking for telescopic crane boom with 6 to 7 ton lifting capacity sling lifting, Japan manufactured, new or used, and three steps boom movementIn united Arab emirates
First off you really don't want to use aluminium and second there is no cheap way to weld itbest would be a TIG welder cheapest would be a MIG welder set up to weld Aluminium, neither are cheap.
do steeldont waste your time on an aluminum frame thats gonna bendand stick weld the steel framestick welders are usually the cheapest welders for the best qualityplus steel is a lot easier to get and a lot cheaper than aluminum.
My advice is to select 4130 Cr-Mo steel (a.k.achromoly) instead of aluminum4130 steel has excellent strength, but is fairly easy to weldIt also costs about the same as common structural aluminum alloys Aluminum needs to be TIG weldedTIG welding produces high-quality joints on otherwise difficult to weld materials like Aluminum Unfortunately, TIG welding equipment is very expensive, and it's the most difficult form of welding to learnIn other words TIG is NOT for amateurs! Go carts are small and light enough that using aluminum won't generally result in major performance gains, typically the rider weighs as much as or more than the cart itselfYou will actually benefit from using steel due to it's greater stiffness and energy-absorption abilities which will result in smoother handlingFor an amateur, stick welding (a.k.aSMAW) is probably the best processStick welding machines are fairly cheapStick welding is of medium difficultyit is more difficult to learn than MIG welding, but is much easier compared to TIG welding.
Try re-asking your question under local business category Good Luck
