Rear loop issue

fendermanz · Tuesday at 11:43 AM

I have a prev post showing what it looked like before powder coating and repairs. The cradle had soo many holes in it like a maxhine gun hit it lol

baz · Tuesday at 5:05 PM

mdt-son said:
The original loop needs to be trimmed forward of the bogus welds, aft of the rear frame bracing plate (061973). You may be able to salvage the gusset plates, however fitting Mk3 gusset plates will give the new loop more support. Shorten the new loop to match this location.
Have short overlap tube stubs made (approx. 6*d long) which fit snugly inside the existing and the new tube. Spot or braze weld the overlap tubes into the remnants of the existing loop (allow 3*d to protrude). Install the prepared new loop section, allowing a small gap. Spot weld new tube section to the overlap tube stubs. Have angle and length measurements taken by a good frame to make sure the new loop is in the correct position wrt. length and angle before finalizing the fillet welds, joining the new loop section to the remnants of the existing tube and the overlap tube by butt welds. Lastly, weld (new or existing) gusset plates to the new loop by fillet welds. Good luck!

- Knut

"Spot weld" ?
I can't see anything that could be spot welded
Please explain

marshg246 · Tuesday at 5:14 PM

baz said:
"Spot weld" ?
I can't see anything that could be spot welded
Please explain

Knut can defend himself but not reading all is a pet peeve of mine. Keep reading what he said beyond "spot weld"

In the US, the term would be tack weld - not sure about the UK and European countries. It certainly needs to be tack welded and checked before final welding.

baz · Tuesday at 6:27 PM

marshg246 said:
Knut can defend himself but not reading all is a pet peeve of mine. Keep reading what he said beyond "spot weld" In the US, the term would be tack weld - not sure about the UK and European countries. It certainly needs to be tack welded and checked before final welding.

I did read all of it
In the UK we tack weld before welding
Are you saying a spot weld means a tack weld?

mdt-son · Tuesday at 6:30 PM

baz said:
"Spot weld" ?
I can't see anything that could be spot welded
Please explain

You are right, there isn't. The term "spot welding" applies to overlapping sheet metal only,
Although the fillet weld beads look like spots (but can be larger), the general term is "tack welding", above posting amended.
Sorry for causing a confusion. No. these are different methods and applications.

- Knut

concours · Tuesday at 6:44 PM

fendermanz said:
I have a prev post showing what it looked like before powder coating and repairs. The cradle had soo many holes in it like a maxhine gun hit it lol

mdt-son said:
You are right, there isn't. The term "spot welding" applies to overlapping sheet metal only,
Although the fillet weld beads look like spots (but can be larger), the general term is "tack welding", above posting amended.
Sorry for causing a confusion. No. these are different methods and applications.

- Knut

RSW = Resistance Spot Weld

marshg246 · Tuesday at 9:00 PM

baz said:
I did read all of it
In the UK we tack weld before welding
Are you saying a spot weld means a tack weld?

No! I know what a spot weld is in the US. I have no idea what a tack weld is called in other countries. My point was that from context it was very clear what he was saying and he clearly talked about fully welding once sure that the length and angle are correct. I have also heard people say "spot it" to keep alignment before full welding - meaning put a spot of MIG/TIG/ARC/etc. in a few spots.

I don't normally see you nitpicking words out of sentences which is so popular here, so I assumes that you missed the rest. I shouldn't have assumed that you didn't read it all.

fendermanz · Thursday at 12:40 PM

Anyone know if you can still get those reinforced loop brackets tgat old brits used to sell, that would work. Hard to find a seat even a cafe style to fits that angled loop uggh

fendermanz · Thursday at 1:02 PM

Madnorton said:
You can trim, pin and weld in a new one at correct angle and length no problem.

By pin do you mean use a pin shaft inside the tube?

fendermanz · Thursday at 1:03 PM

Would the mk3 06.5620 brackets offer better support?

Madnorton · 2025-01-10T01:03:30-0700

fendermanz said:
By pin do you mean use a pin shaft inside the tube?

Yes, as this will support the butt weld area.

Madnorton · 2025-01-10T01:04:46-0700

fendermanz said:
Would the mk3 06.5620 brackets offer better support?

Not really as they don't extend that far along the rear loop.

baz · 2025-01-10T03:26:59-0700

marshg246 said:
No! I know what a spot weld is in the US. I have no idea what a tack weld is called in other countries. My point was that from context it was very clear what he was saying and he clearly talked about fully welding once sure that the length and angle are correct. I have also heard people say "spot it" to keep alignment before full welding - meaning put a spot of MIG/TIG/ARC/etc. in a few spots.

I don't normally see you nitpicking words out of sentences which is so popular here, so I assumes that you missed the rest. I shouldn't have assumed that you didn't read it all.

I guess I'm old and grizzled
I've been a welder for 49 years and I have never ever heard the term "spot weld" used instead of tack weld ! It doesn't make sense to me
It's like saying a screw is the same as a nail to a carpenter
But this is a world wide site so I should remember people in other parts of the world use different terminology
My apologies

baz · 2025-01-10T03:29:05-0700

fendermanz said:
Would the mk3 06.5620 brackets offer better support?

In the UK the police used to weld angle iron to the seat loop to take the weight of the radio and panniers on the Norton Interpol

Rear loop issue

Similar threads