Welding Exhaust Manifolds - The 1947 - Present Chevrolet & GMC Truck Message Board Network

progress · 08-03-2003, 01:03 PM

Anyone done this? I don't know the type of cast iron so I cannot identify the exact welding procedure in my tech books. If someone has done this already it would help to know what procedure works. This is a temporary fix so thanks for offering to send me your free manifold...I am going to headers in the future and don't want to waste the torch work, Bustem, skinned knuckles and gaskets on a replacement right now.

orange71 · 08-03-2003, 07:05 PM

i have tried to weld manifolds and it is very hard!!! i used an arc welder and the right rods and i wasnt able to complete it!! i have heard that brazing them works but i dont no how the brazing deals with the heat of the manifold.

the way i was taugh was to heat the manifold with the torch and then start to arc weld on it but it isnt the easiest form of welding

Good luck!!
Chris

JimKshortstep4x4 · 08-03-2003, 07:42 PM

Depending on the needed repair, brazing has worked well and held up over time. Typical repairs that have lasted are stud "ears" where part of the threads were still there and brazing was used to complete the ear with the stud in place.

Jim

*rickspickuppart* · 08-03-2003, 07:55 PM

any machine shop can do it, it takes a special rod with a high nikle content

mrein3 · 08-03-2003, 10:04 PM

High nickle rods as others have pointed out. Plus you need to heat it up AND COOL IT DOWN. Heat it up with a torch and bury it in sand when you are done so it cools down slowly.

08-03-2003, 01:03 PM	#1
progress Gotta luv a clean shave Join Date: Jan 2002 Location: Kent, WA Posts: 226	Welding Exhaust Manifolds Anyone done this? I don't know the type of cast iron so I cannot identify the exact welding procedure in my tech books. If someone has done this already it would help to know what procedure works. This is a temporary fix so thanks for offering to send me your free manifold...I am going to headers in the future and don't want to waste the torch work, Bustem, skinned knuckles and gaskets on a replacement right now. __________________ Welding while you wait...you can help if you like and it...might even save you a little as long as you don't mess things up! We make house calls too...just like the old days!

08-03-2003, 10:04 PM	#5
mrein3 Registered User Join Date: Feb 2000 Location: Center City, MN, USA Posts: 3,254	High nickle rods as others have pointed out. Plus you need to heat it up AND COOL IT DOWN. Heat it up with a torch and bury it in sand when you are done so it cools down slowly. __________________ '70 cab, '71 chassis, 383, TH350, NP205. '71 Malibu convertible '72 Malibu hard top Center City, MN

08-03-2003, 07:05 PM	#2
orange71 Registered User Join Date: Sep 2002 Location: upland, california Posts: 146	i have tried to weld manifolds and it is very hard!!! i used an arc welder and the right rods and i wasnt able to complete it!! i have heard that brazing them works but i dont no how the brazing deals with the heat of the manifold. the way i was taugh was to heat the manifold with the torch and then start to arc weld on it but it isnt the easiest form of welding Good luck!! Chris

08-03-2003, 07:42 PM	#3
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Depending on the needed repair, brazing has worked well and held up over time. Typical repairs that have lasted are stud "ears" where part of the threads were still there and brazing was used to complete the ear with the stud in place. Jim

08-03-2003, 07:55 PM	#4
rickspickuppart Account Suspended Join Date: Jul 2003 Posts: 1,284	any machine shop can do it, it takes a special rod with a high nikle content



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