4130 TIG welded Custom Roll-bar

[jason@gmachine]

Here is a custom TIG welded 4130 roll bar we did for the owner of Stangwerks.

everything is 4130 and TIG welded, even the plating into the chassis.










Jason

[jason@gmachine]

mas photos!








Jason

[jason@gmachine]

i forgot to add this in, There is a removeable section in the harness bar. We use a specialty machined unit that is TIG welded in and provides an interlocking section that will never rattle and be very strong in the event of an accident.






Jason

[gt1guy]

What filler rod did you use? Did you stress relieve the welds?
Nice work by the way.

Kevin

[jason@gmachine]

some pre heat, mild rod ER 70S. I only use 4130 rod if the entire chassis or suspension parts are getting heat treated. Say, for like 4130 or 4340 arms i would use chromo rod and heat treat the parts. I have welded several 4130 cages like this. The strength of the mild rod with the 4130 is more than enough for the forces the structure will see in this application.

Jason

[viridis]

what would something like this run by chance?

[louie@g-machine]

there are many factors we consider when we price out a roll cage. If the car is brought to us completely gutted then we dont have to charge hourly for taking out interior, and that gets expensive. Because this cage is chromoly and tig welded, metal cost almost doubles over DOM, and labor time nearly doubles as well. I will send you a PM to explain costs.

[NWEBER540]

gmachinei forgot to add this in, There is a removeable section in the harness bar. We use a specialty machined unit that is TIG welded in and provides an interlocking section that will never rattle and be very strong in the event of an accident.



Do you sell these machined parts that you use to be able to remove the bar. Where can I buy the they look very trick and would like to use on the cage I am building. Thanks

[wendell]

Looks good. Why the 4130 plates vs. mild steel?

[jason@gmachine]

Looks good. Why the 4130 plates vs. mild steel?

i have seen way to much 1020 tear to not use 4130. We dont even stock any 1020 sheet anymore. Its all 4130 or nothing at all.


here is a 4130 plate to start a car we are building right now. The entire crossmember is also 4130.






Jason

[jason@gmachine]

Do you sell these machined parts that you use to be able to remove the bar. Where can I buy the they look very trick and would like to use on the cage I am building. Thanks

we do sell them, they are not on our site yet but if you call me i can set you up with them. We are now going to stock several sizes including 1 5/8" tubing ones.

Jason

[parsonsj]

Good stuff guys. Nice work, lovely welds. I used a lot of 4130 in II Much, ignoring naysayers telling me that the welds (or HAZ) would crack.

So far, so good.

jp

[gt1guy]

i have seen way to much 1020 tear to not use 4130.

You do realize that plate is welded to a sea of 1020 right? And, your telling me that for everything that your shop fabricates, 1020 steel just isn't strong enough?

Kevin

[jason@gmachine]

You do realize that plate is welded to a sea of 1020 right? And, your telling me that for everything that your shop fabricates, 1020 steel just isn't strong enough?

Kevin

I consider 1020 a compromise when it comes to plate. Even when we build DOM cagework we use 4130 plate. Its just how i run the shop. Others will disagree with my thinking but i would rather use the best and not compromise. Sure its cheaper to use 1020 but cheap is not what we build. We build quality.


so here is my thinking. On this pic you notice the 4130 plate welded to the "sea of 1020". This plate is 6" by 6" and the tube is 1.75". Now when the force comes down on the main hoop it will press in that circular pattern of the 1.75" tube. Now the 4130 plate will have a less chance of tearing under the force of the tube. I have seen tube tear right through 1020 like it was fiberglass. The plate is welded to a "sea of 1020", you are correct about this. This "sea" is under a larger surface area then a 1.75" tube, in fact you might even say its about 36 square inches. This spreading of the force will distribute the load into the "sea" so that tearing between the plate and the "sea" is minimized.




1020 is a four letter word in our shop! LOL.


jason

[jason@gmachine]

and we now have the tube clamps on sale in various sizes. I will have pics up on our site soon but here is the link.

http://www.gmachineracing.com/burgclamps.html



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