Flipperlady
Well-Known Member
Full Member
- Messages
- 2,325
- Reaction score
- 194
I'd take laser welding of soldering a long span bridge anyday.
A brazed joint is stronger than the filler metal, but not as strong as the parent metal.
This info can be readily found on a welding/brazing info site on the intraweb thingy.
Like I said, I'm no physicist but laser welding does not weld the whole joint like tig welding.
Yes you are welding with the same alloy as the framework is made from, but the penetration
is only 'x' deep where as capillary action pulls the filler alloy into the brazed joint filling it completely
giving it a larger surface area to bond to.
It would be interesting to see how two identical frames one laser welded and one brazed/soldered
would compare on an Ingstrom tester.
This is why I like this site, I always like to learn, seeing how none of us have that INGSTROM majig we will just have to just go with what we have.
I was hoping you would be inspired to splurge on one.
I'll bring the beer.
How about we go to IKEA and set it up on the rig that flexes the chair repeatably. Now that's so high tech shinola!
Will they let us drink beer while we try it? If so I'm in.
A brazed joint is stronger than the filler metal, but not as strong as the parent metal.
This info can be readily found on a welding/brazing info site on the intraweb thingy.
Like I said, I'm no physicist but laser welding does not weld the whole joint like tig welding.
Yes you are welding with the same alloy as the framework is made from, but the penetration
is only 'x' deep where as capillary action pulls the filler alloy into the brazed joint filling it completely
giving it a larger surface area to bond to.
It would be interesting to see how two identical frames one laser welded and one brazed/soldered
would compare on an Ingstrom tester.
Gave up soldering 17 years ago and bought a laser welder. Welding with same alloy gives the strongest weld possible and makes sure their are no galvanic or corrosive reactions. I would have to disagree that a soldered joint is as strong as a welded one, as the solder itself is the weakest link (lower melting point). Once you have mastered the laser weld you have mastered physics.
Since we're on the subject of bridges, I've always had issues with implant bridges fitting properly.. I decrease my water powder ratio by 3-4 ML of liquid for bridges, yet almost always have at least a small "tick" on implant bridges, but not regular bridges... any ideas what the difference is? Is it just the fact that its a solid model with no give?
Interesting info. You will see more and more metal fabricating shops using laser than tigs/brazed. You can control the heat source.
This morning, I laser welded a long span bridge welding 3 areas. Not labs casting fault, doctors preps... Anyway, I was able to
change the parameter settings to meet the necessary amount heat and spot size to weld them without destroying any margins, etc.
The bridge was luted together, then invested in stone to allowing me to weld all three. Once finished, divested using shell blaster.
As for penetration of the weld? Use of the parameter settings, controlling the heat and spot size. You can move metal from the side
walls of both copings to get your connection into the center and move outwards with your build up adding wire. Also while adding the
wire "filler", over lapping the welds is a must for a strong joint. Also to add. A doc called the other day to have a milled bar welded
as he possibly made an error in his impression taking. All-on-4, Glidewell bar, #11 was 1mm off with other 3 seated.
He was concerned due to the thickness that it may not be as strong. 4mm bar was cut, properly aligned, luted and invested.
Welded using the same technique as above. My Ingstrom tester " if it doesnt come back, it worked"
Are you filling the entire joint or overlapping surface perimeter tack welds?
I like your Ingstrom tester as well, I have the same one.
I have a phazer welder from Primotec. I tack a spot on the buccal and lingual to hold the sections together then solder the connector with my torch. This takes about 2 minutes literally. I have tried welding the whole connector but no matter how careful and slow I try it still rocks when finished It takes a long time to weld a connector even if it does work compared to the technique I described above.
I have a phazer welder from Primotec. I tack a spot on the buccal and lingual to hold the sections together then solder the connector with my torch. This takes about 2 minutes literally. I have tried welding the whole connector but no matter how careful and slow I try it still rocks when finished It takes a long time to weld a connector even if it does work compared to the technique I described above.
I if i need to but it is rare that i need to sNo one else wants to share his secret technique?
No one else wants to share his secret technique?