Weld grinding

[robertearl]

I am repairing a Ford GPW jeep frame. The frame is a C section that is 4.5 inches tall. I have replace a large section of it due to rust and I can grind down the weld on the outside easily. The grinder wont fit into the inside of the C section to grind it down. I have looked for a disk smaller that 4.5 inches but have not had any luck. Any thoughts on how to get the inside ground flush. I would like it flush for the restoration of the frame.

Reb

 

[metlmunchr]

Plenty of discs available in 4" dia for 4" grinders. But you also have to have the 4" grinder because the hole in the 4" wheels won't fit on a 4.5" grinder.

I've got a couple 4's and a couple 4.5's, and I'd say I use the 4's 75% of the time over the larger ones.

 

[tarbellb]

Die grinder. Lots of abrasive options for the 1/4" collet.

 

[tlmartin84]

Angle Die Grinder, 3" discs on an arbor.

 

[jack stand]

I'd use a new 7" or 9" disc on your big grinder, grinding with the edge of the wheel. You may be able to do this with a new 4.5" disc also but you loose visibility.

 

[Com_VC]

Die grinder with burr, they work better than the abrasive ones.

10mm, 20mm or 30mm air belt sander.

Angle die grinder with 3" disk as already mentioned.

 

[matt_i]

If you are looking to get a new tool, Milwaukee makes a corded "band file" which is a mini belt sander with a 1/2" x 18" circumference belt. Works very well in confined spaces. I used it to quickly remove the ERW seam-weld from square tubing (in short lengths of course) so they would telescope.

Also if you got a right angle die grinder (air operated, IR makes a miniature one, don't know the part number) you can use something like 2" roloc disks.

 

[joe49]

Couple of thought's leaving the inside the c section weld proud will be stronger. Did you angle cut or z cut or v cut your splice. If you straight cut, you should also fish plate the splice.

 

[BD1]

I have a Dynabrade 1/2x18 belt sander like the Milwaukee mentioned. They do have a 1/4'' wide belt and wheel that can fit almost anywhere.
Maybe this Metabo might fit.
https://www.amazon.com/dp/B00HZO1CY2/?tag=atomicindus08-20

https://www.metabo.com/us/enus/info/news/highlights/new-flat-head-angle-grinders/

https://www.amazon.com/dp/B005TITYA0/?tag=atomicindus08-20

 

[ttpete]

2"or 3" Roloc disk on a 1/4" arbor on a die grinder.

 

[f150skidoo]

Couple of thought's leaving the inside the c section weld proud will be stronger. Did you angle cut or z cut or v cut your splice. If you straight cut, you should also fish plate the splice.

Was thinking the exact same thing.

 

[sberry]

The real stress on a frame is on the flanges, web not so much. If it is 100 percent welded grinding flush can be good to relieve stress risers at the edge of the weld. This is important with stuff that flexes.
If I weld it right rarely plate.