Structural Rivet Removal
Structural Rivet Removal
(OP)
A specification calls for the removal of structural rivets with out using pneumatic rivet breakers. In fact the proceedure is specified as follows: Using a rivet scarfing tip on a cutting torch remove all but 2mm of the head material then grind the remaining portion of the rivet head flush with the base metal. The rivet shank shall be removed by drilling.
Due to problems with the base metal I cannot allow the use of "hell dogs".
If I go ahead and impliment this spec how long can I expect it to take to remove one rivet in 3 and 4 ply material.
Due to problems with the base metal I cannot allow the use of "hell dogs".
If I go ahead and impliment this spec how long can I expect it to take to remove one rivet in 3 and 4 ply material.





RE: Structural Rivet Removal
Rod
PS---I haven't seen, let alone used, a "helldog" since 1961.
RE: Structural Rivet Removal
We have a torch here, not quite sure of the name,(tool rooms closed) but basically you need oxygen, a 12v battery and a good set of leathers. In simple terms you strike an arc with the rod which starts it burning when you turn on the oxygen. After you have it ignited you put the end of the rod against the pin, rivet or what ever you're wanting to remove and blow a hole thru the center. We use it here to blow out king pins, cylinder pins etc. If you're interested post back and I'll get the name...Mike
RE: Structural Rivet Removal
RE: Structural Rivet Removal
it's a slick rig...Mike
RE: Structural Rivet Removal
RE: Structural Rivet Removal
The snap was usually chisel or shovel shaped but you had a 'spoon' snap you could use as well. It was capable of cutting the heads off structural rivets of just about ANY size. With care and practice it was effective and fast (and VERY loud). You still had to 'blow' through the rivet to knock it out. Rivets upset in the joint and cannot easily be driven out without damaging the holes unless that center is perforated, even a small hole works. A small rivet gun like a "90" or 80XX will work but a hammer and drift will work in a pinch.
Rod
RE: Structural Rivet Removal
Blacksmith
RE: Structural Rivet Removal
We still use helldogs in New York City. For what it's worth, NYSDOT spec's prohibit burning off rivet heads.
RE: Structural Rivet Removal
RE: Structural Rivet Removal
At least 2 of them turn up on a "Google" search.