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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
Posted to rec.crafts.metalworking
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Chain welding
How are commercial chain links welded? My first guess is using resistance
but I would guess the electricity would be more likely to take the path around the link than across the touching faces. |
#2
Posted to rec.crafts.metalworking
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Chain welding
"Charles P Lamb" wrote in message . .. How are commercial chain links welded? My first guess is using resistance but I would guess the electricity would be more likely to take the path around the link than across the touching faces. that's funny (was thinking about this last night). that's something i've always wondered about welded seam pipe. how come the electricity doesn't flow around the back instead of through the joint. i mean, obviously it works, but it would seem to me the juice would flow through the metal instead of through the weld. |
#3
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Chain welding
"William Wixon" wrote in message ... "Charles P Lamb" wrote in message . .. How are commercial chain links welded? My first guess is using resistance but I would guess the electricity would be more likely to take the path around the link than across the touching faces. that's funny (was thinking about this last night). that's something i've always wondered about welded seam pipe. how come the electricity doesn't flow around the back instead of through the joint. i mean, obviously it works, but it would seem to me the juice would flow through the metal instead of through the weld. You'd think that, but you'd be wrong. I have an old DoAll saw equipped with a blade welder. If you try to weld pieces that do not complete a loop, it won't weld them. Sort of defies everything you think you know about electricity, doesn't it? Harold |
#4
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Chain welding
I also have a DoAll blade welder and often weld two short pieces of
scrap blade together to dial in the settings. It is odd that your welder requires a full loop. These welders can be finicky. Mine once was making making great welds, and the next minute it wouldn't weld anything. After a lot of investigation I found that the moveable jaw was sticking. |
#5
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Chain welding
"twolluver" wrote in message ... I also have a DoAll blade welder and often weld two short pieces of scrap blade together to dial in the settings. It is odd that your welder requires a full loop. These welders can be finicky. Mine once was making making great welds, and the next minute it wouldn't weld anything. After a lot of investigation I found that the moveable jaw was sticking. I wonder if it's because mine is very old---it was built in '43----perhaps with lower technology. I struggled like hell to make a good blade from two short pieces of new stock. Finally resorted to clamping the loose ends together and got instant success. Being a retired toolmaker, I completely rebuilt the clamping assembly on my welder. It looks as good as a new one---works perfectly aside from not welding pieces. Harold |
#6
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Chain welding
On Wed, 02 Jan 2008 19:32:35 GMT, "Harold and Susan Vordos"
wrote: "twolluver" wrote in message ... I also have a DoAll blade welder and often weld two short pieces of scrap blade together to dial in the settings. It is odd that your welder requires a full loop. These welders can be finicky. Mine once was making making great welds, and the next minute it wouldn't weld anything. After a lot of investigation I found that the moveable jaw was sticking. I wonder if it's because mine is very old---it was built in '43----perhaps with lower technology. I struggled like hell to make a good blade from two short pieces of new stock. Finally resorted to clamping the loose ends together and got instant success. Being a retired toolmaker, I completely rebuilt the clamping assembly on my welder. It looks as good as a new one---works perfectly aside from not welding pieces. My theory is that the current is to high without the loop. I know on my blade welder I can't weld to short a loop of large blade (say 24" of 3/4" blade). The loop definitely takes some of the power out of the weld but most of it still takes the shorter path. |
#7
Posted to rec.crafts.metalworking
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Chain welding
On 2008-01-02, Harold and Susan Vordos wrote:
"William Wixon" wrote in message ... [ ... ] that's funny (was thinking about this last night). that's something i've always wondered about welded seam pipe. how come the electricity doesn't flow around the back instead of through the joint. i mean, obviously it works, but it would seem to me the juice would flow through the metal instead of through the weld. You'd think that, but you'd be wrong. I have an old DoAll saw equipped with a blade welder. If you try to weld pieces that do not complete a loop, it won't weld them. Sort of defies everything you think you know about electricity, doesn't it? I think that in *that* situation -- the welder is depending on the current through the back loop to trigger the solenoid which brings the ends of the blade into firm contact to make the weld. I've never bothered to actually trace out the circuitry for the stand-alone blade welder which I have, however. Enjoy, DoN. -- Email: | Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
#8
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Chain welding
"DoN. Nichols" wrote in message ... snip---- I think that in *that* situation -- the welder is depending on the current through the back loop to trigger the solenoid which brings the ends of the blade into firm contact to make the weld. I've never bothered to actually trace out the circuitry for the stand-alone blade welder which I have, however. My unit is pretty primitive. The motion that brings the blade ends together is manual, a lever that is depressed. I'm mystified by this thing, DoN. Harold |
#9
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Chain welding
Harold and Susan Vordos wrote:
"DoN. Nichols" wrote in message ... snip---- I think that in *that* situation -- the welder is depending on the current through the back loop to trigger the solenoid which brings the ends of the blade into firm contact to make the weld. I've never bothered to actually trace out the circuitry for the stand-alone blade welder which I have, however. My unit is pretty primitive. The motion that brings the blade ends together is manual, a lever that is depressed. I'm mystified by this thing, DoN. I have a pretty primitive blade welder too, but it welds hacksaw blades just fine. Doubt we'll ever get to the bottom of Harold's, glad his blade welder works! Grant -- Posted via a free Usenet account from http://www.teranews.com |
#10
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Chain welding
On 2008-01-03, Harold and Susan Vordos wrote:
"DoN. Nichols" wrote in message ... snip---- I think that in *that* situation -- the welder is depending on the current through the back loop to trigger the solenoid which brings the ends of the blade into firm contact to make the weld. I've never bothered to actually trace out the circuitry for the stand-alone blade welder which I have, however. My unit is pretty primitive. The motion that brings the blade ends together is manual, a lever that is depressed. I'm mystified by this thing, DoN. Interesting. Mine has a solenoid which unlatches the blade holders to slide together -- or which draws them together. I would have to clear the space to open it up again to verify which in this case. Unplug the unit and press the button, and the holders stay separated. (And yes, I think that they all are rather primitive -- but if that does the job -- who cares? :-) Enjoy, DoN. -- Email: | Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
#11
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Chain welding
As you increase the frequency the current is less willing to take the
long path do to inductance. |
#12
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Chain welding
"Charles P Lamb" wrote in message . .. How are commercial chain links welded? My first guess is using resistance but I would guess the electricity would be more likely to take the path around the link than across the touching faces. Yes it's resistance welded. They did a segment on (I think) "How it's made" on chain. Interesting sequence of events! |
#13
Posted to rec.crafts.metalworking
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Chain welding
On Wed, 02 Jan 2008 04:31:13 GMT, with neither quill nor qualm,
"BillM" quickly quoth: "Charles P Lamb" wrote in message ... How are commercial chain links welded? My first guess is using resistance but I would guess the electricity would be more likely to take the path around the link than across the touching faces. Yes it's resistance welded. They did a segment on (I think) "How it's made" on chain. Interesting sequence of events! I couldn't find that so I kept looking until this popped up: http://www.nvo.com/baldtus/makingchain/ --- Stay centered by accepting whatever you are doing. This is the ultimate. --Chuang-tzu (369 BC - 286 BC) |
#14
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Chain welding
On 2008-01-02, Larry Jaques novalidaddress@di wrote:
I couldn't find that so I kept looking until this popped up: http://www.nvo.com/baldtus/makingchain/ Larry, that was a great page to look at, thanks. (and probably not a great place to work at) i |
#15
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Chain welding
On Wed, 02 Jan 2008 08:52:35 -0600, Ignoramus3921 wrote:
On 2008-01-02, Larry Jaques novalidaddress@di wrote: I couldn't find that so I kept looking until this popped up: http://www.nvo.com/baldtus/makingchain/ Larry, that was a great page to look at, thanks. (and probably not a great place to work at) When I was much younger my father worked at Campbell Chain and quite enjoyed it. Until the Campbell's sold it and the new boss wasn't so good... Now of course the Campbell name has had 30 years of change. sdb -- What's seen on your screen? http://PcScreenWatch.com sdbuse1 on mailhost bigfoot.com |
#16
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Chain welding
Charles P Lamb wrote:
My first guess is using resistance but I would guess the electricity would be more likely to take the path around the link than across the touching faces. It is and why it works was explained by others. Saw a film where they made chains and it was *really* impressive. Not that kind of neglace chains, but *real* chains. For ships anchors. It's a hard work to connect the links (it was some kind of carussell (SP?). The links were about 500mm long, diameter something like 100mm or more. Big presses and the welding machine ... I don't want to pay their electricity-bill! :-) Nick -- The lowcost-DRO: http://www.yadro.de |
#17
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Chain welding
Nick Mueller wrote:
It is and why it works was explained by others. Saw a film where they made chains and it was *really* impressive. Not that kind of neglace chains, but *real* chains. For ships anchors. It's a hard work to connect the links (it was some kind of carussell (SP?). The links were about 500mm long, diameter something like 100mm or more. Big presses and the welding machine ... I don't want to pay their electricity-bill! :-) I've seen lengths of anchor chain attached to wire rope for use to snag the arresting hook of an aircraft equipped to use it. Damn impressive chunks of steel. Dragging the chain down a runway after hitting the wire sure slows down an aircraft quick. Must be fun work in summer hauling the chains back and resetting the wire. Wes |
#18
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Chain welding
On Tue, 1 Jan 2008 21:16:41 -0500, "Charles P Lamb"
wrote: How are commercial chain links welded? My first guess is using resistance but I would guess the electricity would be more likely to take the path around the link than across the touching faces. I find it intriguing that this topic came up. I've been trying to figure out how to make welded links for things like chainmail, safety-mail (like the microlink gloves that prevent you from cutting yourself while filleting fish) and even necklaces. I just found the following site that talks about Resistance welding... http://www.key-to-steel.com/Articles/Art76.htm The Wiki says that currents from 100 to 100K amps are used... Hmmmm.... I wonder how hard it would be to design a Homebuilt power supply for a Resistance welding rig? Jaeger Seattle, WA "Dead wizards are not known to sleep soundly, nor to wake jovial" |
#19
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Chain welding
Jaeger Jaeger @sprite's_grove.com writes:
Hmmmm.... I wonder how hard it would be to design a Homebuilt power supply for a Resistance welding rig? Quite a few people have made spot welders by using the transformers from a pair of microwave ovens... I don't have the URL for the dropbox handy, but I think I saw a very nice example of one of these power supplies there. |
#20
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Chain welding
Jaeger wrote:
... The Wiki says that currents from 100 to 100K amps are used... Hmmmm.... I wonder how hard it would be to design a Homebuilt power supply for a Resistance welding rig? 100 amps - piece of cake. 100k amps would be a bit of a challenge. First you get 100 microwave oven transformers ... Bob |
#21
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Chain welding
Building a power supply for what you are talking about might be very
doable. Maybe even tasking an old resistance welder for such work. What I'm wondering though is has anyone approached this issue with a TIG welder? Especially for larger chain used in boating. Obviously it would be very slow compared to a resistance system designed for such welds, but you should be able to fashion any size chain in small lengths. Getting penetration would be an issue but I would think your welds would be better than a resistance job where the ends just get squished together. Any thoughts. On Wed, 02 Jan 2008 03:17:51 -0800, Jaeger wrote: On Tue, 1 Jan 2008 21:16:41 -0500, "Charles P Lamb" wrote: How are commercial chain links welded? My first guess is using resistance but I would guess the electricity would be more likely to take the path around the link than across the touching faces. I find it intriguing that this topic came up. I've been trying to figure out how to make welded links for things like chainmail, safety-mail (like the microlink gloves that prevent you from cutting yourself while filleting fish) and even necklaces. I just found the following site that talks about Resistance welding... http://www.key-to-steel.com/Articles/Art76.htm The Wiki says that currents from 100 to 100K amps are used... Hmmmm.... I wonder how hard it would be to design a Homebuilt power supply for a Resistance welding rig? Jaeger Seattle, WA "Dead wizards are not known to sleep soundly, nor to wake jovial" |
#22
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Chain welding
"Charles P Lamb" wrote in message . .. How are commercial chain links welded? My first guess is using resistance but I would guess the electricity would be more likely to take the path around the link than across the touching faces. In the Black Country, traditionally by hammer welding, and often by women. Fred Dibnah covered it in one of his programs when he went round Britain showing lapsed technology after he was diagnosed with terminal cancer. ~Even huge anchor chains were hammer welded. AWEM |
#23
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Chain welding
On Tue, 1 Jan 2008 21:16:41 -0500, "Charles P Lamb"
wrote: How are commercial chain links welded? My first guess is using resistance but I would guess the electricity would be more likely to take the path around the link than across the touching faces. It isn't an all-or-nothing situation. Some current will go 'round the back way, but if the electrodes are close to the joint and the faces makes good contact, then most of the current will go thru the joint. |
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