do i need to start again

[allan0705]

hi i have just started my build and i have just found out that i think i have been using the wrong steel i have been using RHS and i should have been using ERW i am about half way throw building the chassis and i dont now if it is ok to using what i am or do i need to start again please please help

[flyerncle]

I could be wrong but, RHS stands for rectangular hollow section and ERW is elecrtic resistance welding. As long as the steel is bright metal and not black and the correct thickness ie: 1.6 mm it should be ok.

Post a picture of the metal.

[ACE HIGH]

RHS is rectangular hollow section and will be 3mm thick.In my opinion,no you do not need to start again,as you have probably started on the lower frame which needs to be strong anyway.Keep it equal both sides and fill in the rest with 1.6 or 1.8 .or 2.0 mm ,whatever you have over there.If you plan on putting a powerful engine in (150 hp or more),then it will be just fine as I hold the view that the chassis needs a bit more strength for the higher power outputs used.
There will be a very minor weight increase for considerable extra strength and it will be easier to weld,especially if using an arc welder.
Over here a very popular clubman 7 is called a Chevron,had one myself and the main framework was and still is 40x40 x3 RHS,I really liked that chassis design as it was very strong and resisted rusting and was easy to weld brackets to.
So no, use what you have and it will be just fine.David

[NEroadster]

flyerncle you are quite correct RHS refers to the profile of the tube i.e rectangular and ERW refers to the rproduction method in this case folded from a flat sheet then welded. Chances are your RHS will have been produced this way it just might not state the fact, see if you can see a weld line

[allan0705]

thanks for al your feed it is SHS square section and my big consern is will it pass the i v a ?????????????

[AshG]

it wont make any difference for iva.

[ozzy1]

One thing to note though is that ERW has better characteristics in the event of a crash as it tends to 'crumple' .