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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Wed, Dec-05-2018, 03:47:38 AM   #11
JerseyDriver820
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Default Re: subframe crack and reinforcement information

Reviving an old topic as the OP appears to having welding knowledge and chassis experience. I have searched and it appears that no one is gas welding cracks shut, or gas welding the reinforcement plate on.

The main way people attach these plates is by a MIG welder. Some people choose TIG, which can be somewhat expensive depending on how "proper" of you tool you think the job requires. I'm curious why gas welding and fusing the metal together with a filler has not been the preferred method. Gas welding has been a tried and true method of welding long before MIG or TIG became a thing.

Just curious and looking for advice as I'm gearing up to preform this work.
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Old Wed, Dec-05-2018, 10:47:59 AM   #12
Eduki
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Default Re: subframe crack and reinforcement information

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Originally Posted by JerseyDriver820 View Post
Reviving an old topic as the OP appears to having welding knowledge and chassis experience. I have searched and it appears that no one is gas welding cracks shut, or gas welding the reinforcement plate on.

The main way people attach these plates is by a MIG welder. Some people choose TIG, which can be somewhat expensive depending on how "proper" of you tool you think the job requires. I'm curious why gas welding and fusing the metal together with a filler has not been the preferred method. Gas welding has been a tried and true method of welding long before MIG or TIG became a thing.

Just curious and looking for advice as I'm gearing up to preform this work.
... Maybe because it's a vertical soldering?
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Old Wed, Dec-05-2018, 02:17:37 PM   #13
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Default Re: subframe crack and reinforcement information

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Originally Posted by Eduki View Post
... Maybe because it's a vertical soldering?
Overhead and vertical welding may be done with gas welding.
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Old Wed, Dec-05-2018, 03:08:23 PM   #14
Eduki
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Default Re: subframe crack and reinforcement information

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Overhead and vertical welding may be done with gas welding.
May be, but it's not the proper welding.
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Old Wed, Dec-05-2018, 08:58:51 PM   #15
JerseyDriver820
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Default Re: subframe crack and reinforcement information

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May be, but it's not the proper welding.
Is any weld the "proper" weld for overhead? With a mig gun its hard to see where your even pointing the thing sometimes. Also with a mig gun you can easily overheat an area.
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Old Wed, Dec-05-2018, 11:28:55 PM   #16
staul m3
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Default subframe crack and reinforcement information

Gas welding would be a slow pain in the ass method with a huge heat affacted zone and would most likely damage more corrosion protection layers on the back side.

Tig is too slow, a good welder with plenty of thin sheet experience will mig it easily.


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Last edited by staul m3; Thu, Dec-06-2018 at 01:32:26 AM.
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Old Thu, Dec-06-2018, 02:49:05 AM   #17
JerseyDriver820
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Default Re: subframe crack and reinforcement information

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Originally Posted by staul m3 View Post
Gas welding would be a slow pain in the ass method with a huge heat affacted zone and would most likely damage more corrosion protection layers on the back side.

Tig is too slow, a good welder with plenty of thin sheet experience will mig it easily.


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Explanation I was looking for. Thanks Staul


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Discussing subframe crack and reinforcement information in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)