thickness vs strength?

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Hello all,I am some what an amature to the whole aspect of welding even though I have welded wire feed quite a bit.  I am looking for a web site or other info on thickness vs strength of steel.  I am looking at welding up a atv hauler for the back of my truck but have a 28" over hang off the back that I want to be sure I use strong enough tubing. I could go way overboard like I usually do but am in need of a rack that is not so heavy that I need 30 guys to move.  I am also looking for it to be strong enough to side load an atv with out a problem. I am looking for a web site preferably that has diferent wall thicknesses for angle iron and tube/triangular steel and assesses their strength in amount of weight it can handle.  I plan on using 1 1/2 " tube mostly with some angle iron on the bottom. any Help will be apreciated.  Thank you.
Reply:Id say the 1 1/2" will work.  These usually come I think 1/8"  This should be plenty strong.  1 1/2" angel of 1/8" equals a lil stronger than 1 1/2" 1/4" angle imo.  I would think youll be just fine.    However, what is the weight of this atv so I can better grasp and hopefully give you a better idea.IF it Catches...Let it Burn
Reply:Originally Posted by TxRedneckId say the 1 1/2" will work.  These usually come I think 1/8"  This should be plenty strong.  1 1/2" angel of 1/8" equals a lil stronger than 1 1/2" 1/4" angle imo.  I would think youll be just fine.    However, what is the weight of this atv so I can better grasp and hopefully give you a better idea.
Reply:How far back will this framework begin.  I know it will extend out 28in but what will the total length be including this 28in.  I would say in general yes this will be fine.  I could suggest adding a piece or two in the middle as well.  What will be the width?IF it Catches...Let it Burn
Reply:Originally Posted by TxRedneckHow far back will this framework begin.  I know it will extend out 28in but what will the total length be including this 28in.  I would say in general yes this will be fine.  I could suggest adding a piece or two in the middle as well.  What will be the width?
Reply:sounds good to me   if it seems to flexy...always can add a few more cross members good luck...IF it Catches...Let it Burn
Reply:Originally Posted by TxRednecksounds good to me   if it seems to flexy...always can add a few more cross members good luck...