Roll Cage Weld question

scruffydog · 12-22-2013, 06:21 PM

I'm trying to make some custom fabrication pieces to weld my roll cage in. Normally for tubes I know I should use 4130 chromoly (shown as PVC pipe in Picture).

For the rear tower I need to make some plates to weld to the body of the car. I believe the car body is Aluminum, can I fab some Aluminum plates and weld the 1.75" OD 4130 chromoly tube to it?

synolimit · 12-22-2013, 06:28 PM

Don't have to use chromoly. Use mild steel DOM. Cheaper and you don't gain that much weight. And no the car is not aluminium, its steel. Use 3/16th mild steel plate. I believe cold rolled is stronger.

Only thing aluminium is the hood, hatch, and doors.

Just an FYI if you want price and weight and strength. Unless you get under 3k you need 1.75" x 0.120".

Shamu · 12-22-2013, 11:22 PM

Car body is steel not aluminum ...so no special fabrication required. just use mild steel. Only doors, rear hatch and front hood are aluminum.

synolimit · 12-23-2013, 02:19 AM

Echo eccchhooo eeeeccchhhhhoooo haha

scruffydog · 12-23-2013, 02:36 AM

thank you both! I'll keep you guys posted.

Wonka2581 · 12-23-2013, 05:59 AM

In for pics when your done....

Boss_302 · 12-23-2013, 12:33 PM

A quick way to check if its steel and wieldable is check it with a magnet. Also be careful with the heat settings, its very easy blowing thru the sheet metal used in the stampings.
Anything that is close by remove it or protect it with a wet rag, it amazing how fast heat travels and how much focus you don't have around you when wielding. Also disconnecting the battery ground is a good idea to prevent feed back to brain box. just My 2$

12-22-2013, 11:22 PM	#3 (permalink)
Shamu A True Z Fanatic Join Date: Jan 2011 Location: Nor Cal Posts: 1,059 Drives: 370Z Racecar Rep Power: 19	Car body is steel not aluminum ...so no special fabrication required. just use mild steel. Only doors, rear hatch and front hood are aluminum. __________________ Grant Last edited by Shamu; 12-22-2013 at 11:25 PM.

12-23-2013, 02:19 AM	#4 (permalink)
synolimit A True Z Fanatic Join Date: May 2013 Location: Columbus, OH Posts: 5,051 Drives: 2013 Silver 370z Rep Power: 3389	Echo eccchhooo eeeeccchhhhhoooo haha Wonka2581 likes this. __________________ 13 370z-

12-23-2013, 02:36 AM	#5 (permalink)
scruffydog A True Z Fanatic Join Date: Jan 2009 Location: Nor Cal Posts: 1,113 Drives: with his eyes close Rep Power: 717	thank you both! I'll keep you guys posted. __________________ Magnetic Black 2010 370z Scruffydog's Journal

12-23-2013, 05:59 AM	#6 (permalink)
Wonka2581 A True Z Fanatic Join Date: Nov 2012 Location: Chattanooga, TN Posts: 3,083 Drives: MY WIFE CRAZY.... Rep Power: 2612	In for pics when your done.... __________________ "I have nothing to offer but blood, toil, tears and sweat""Winston Churchill"

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12-23-2013, 12:33 PM	#7 (permalink)
Boss_302 Base Member Join Date: Feb 2013 Location: NY NY Posts: 150 Drives: 11 Nissan 370z S Mt Rep Power: 12	A quick way to check if its steel and wieldable is check it with a magnet. Also be careful with the heat settings, its very easy blowing thru the sheet metal used in the stampings. Anything that is close by remove it or protect it with a wet rag, it amazing how fast heat travels and how much focus you don't have around you when wielding. Also disconnecting the battery ground is a good idea to prevent feed back to brain box. just My 2$