Gazoo, after dipping your hot tip in a tin of flux occasionally, just a quick dip and back out, you can then tin the tip by rubbing the end of the solder over it for only as long as it takes for the tip to become silvery again…no more. That solder is now devoid of any resident flux, so you will have to lightly wipe the surfaces to be joined with just a kiss of flux before you touch the hot, silvery tip to the items to be joined. It should all just take that long.
I do agree that a chisel tip, about the size of a smallish flat-tipped screwdriver, is best for getting heat transfer between surfaces. The pointy ones have much less surface area and therefore contact.
FoulRift, Bob, if you can’t solder, there are two things to do, and in order. First, make good darned and sure that your tracks are well supported where they lie so that they don’t dip and twist when trains pass overhead. That splays and weakens joiners like nobody’s business. Secondly, you can take needle nosed pliers and pinch closed the flanges on the joiners. That will help a lot, but it tends to ruin the joiners. It raises the risk of damage outright as you do this. You could mistakenly lift the rail out of its little tie head retainers, although the risk should be slight.
Of course, as has been stated, it would really help if the rail feet and web were cleared of any oils first. Perhaps a Q-tip dipped in acetone and scrubbing the metal of the rail would be a good idea before you slip the joiner into place. Just try to keep the acetone away from any plastics such as adjacent ties.
I’VE SEEN A LOT OF INFO HERE ABOUT SOLDERING BUT THE ONE AND MOST IMPORTANT THING HAS NOT BEEN MENTIONED! YOU MUST TOUCH THE FLATOF YOUR IRON TO THE FLAT OF THE RAIL TO GET THE BEST HEAT TRANSFER. If you touch the sharp tip of your iron to the rail you will have a minium of heat transfer. TRY IT. yOU’LL SEE THE DIFFERENCE.
guns? omy, they work, I use an iron. 19 bucks or less at radio shack, widely sold everywhere really. Solder a wire to a joiner, connect your tracks then solder the joiner on. Guns are heavy to hold, irons are heat ready when heated up, just keepem in the holder when not in use. Do get a good iron holder. Dont use the cheapie lay down on the table holder.
Ray’s answer to this one above should have had the Mythbusters “Warning Science Content” plate at the beginning.
The technique is one I learned years ago in the Air Force, their High Reliabilty Soldering course. That little bubble of solder on the iron tip acts as a heat transfer, remembering that the metals being joined have to get hot enough to melt the solder. The bubble of solder, being molten, will shape to the joint and make the heat transfer faster by bringing the heat source into contact with a larger area of the joint. Once the flux vaporizes (don’t breathe the fumes) the solder flows into the joint area. Just before touching the iron to the joint, I usually start a slow exhale across the joint, that way the flux fumes blow away from me.
Solder does have to touch the tip. What you remember hearing was probably just a small part of the rule for making large solder joints. Tinning and cleaning the tip are also important to keeping the soldering iron in good shape and ready to go. Most soldering iron stands and all soldering stations have a small tray for a sponge. This sponge is to be kept wet while you’re working with the iron, and after each joint, I do a quick wipe of the tip over the sponge to remove any flux residue from the tip. While working, the tip should A
Any particular recommendations for using soldering guns instead of irons? Tip recommendations for HO code 83? I’ve got a couple of guns I inherited from my father but some local folks have told me that an iron is
easier to solder track due to it’s size. I’ve used an iron so far on a friend’s layout…
Thanks.
Very well said! Tip mass is the issue with most irons. You need mass to transfer heat. Square chisel tips have the best mass. The rail will suck heat out of the iron. A low mass (pointed tip, pencil tip) iron will melt ties before solder flows between the rail and the joiner.
The flux helps transfer heat, while as well as cleaning the m
Just after a joint is soldered, I like to do a quick wipe with a damp rag, to clean the “now dirty” flux residue before it has time to set-up, and the soldered joint also cools a little quicker. You may hear a small “sizzle” on the wet rag.
It is a little trick adopted from soldering copper plumbling and stained glass.
A solder gun heats in seconds and cools down just as fast. You can set the gun down on the layout without risking burns. An iron takes minutes to reach soldering temperature and stays hot, so you need a heat resistant fire proof stand to set it down upon, unless you like burn marks on the layout. Once hot, the larger tip of a big iron holds more heat and will heat a joint to soldering temp faster than a gun.
A gun is somewhat more convenient, a hot iron is a bit faster. Good solder joints on rail can be acheved with either tool.
Hi Gazoo - wow - you have so many good suggestions and many yrs of experience to tap into
I must confess - I have only been doing this for the past 4 yrs but I did learn a lot from the Weller web site - since these people make a fine product that most of us use and they have the knowledge on how to care for the soldering gun and useful practices as well.
at our Club - Waterloo Regional Model Railway Club in Southwestern Ontario, -we solder 22 gauge feeders onto the under side of each and every single piece of rail in the visible area of the layout -the rail is all hand laid on wooden ties so less concern for plastic melting. I make sure to clean the under side with a fine strip of sandpaper, as you have learnded one of the key and most important principles to remember is that both surfaces must be as clean as you can make them.
I find the hotter the gun the faster the job -and that is generally the story you gather from all these other fellows and fast is best - so I use a 150W Weller gun ( I don’t have a hotter one ) and the tip about not using an extension cord is so important as well. ( I must remember to do that more myself - I confess some times I plug into the extension cord near where I am working and then it takes longer to heat up as well )
we do not tend to solder the rail joiners as we found we prefer not to depend on them for conductivity between rails - thus we solder every piece of rail - yes I agree it takes more time but this ensures no loss of power on the rails - this also permits for expansion and contraction with the extremes of temperature and humidity we find up here.
on the hidden track - we use Flex track and I solder onto the outside of the rail - I actually clean the soldering tip and hold onto the top of the rail here and tin the outside of the rail 1st then apply heat to the this spot again when I press the tinned wire to the same spot - works great for me .
Dstarr, thanks. I could see there’d be times when you want to solder a lot of track at once and the iron could indeed be handier/faster. I kind of wanted to use my late Dad’s guns, but I think I’ll use them for something else instead of track soldering maybe. What size tip do you like for your gun? I have two, a larger and smaller but I can’t access them to see what sizes they are right now… (big enough and plenty! though.)
PhilCPR, If you solder all rail joints together how does that allow for expansion/contraction? Was that a typo and did you mean to say every other rail joint or something of that sort? Thanks/
With soldering guns you don’t get a choice of tips. There is one tip that fits your gun and thats the one you use. This probably comes from the fact that the electrical resistance of the tip must be just right for the gun to work. If the length or thickness of the tip is changed the electrical resistance changes and that isn’t allowed with guns. In fact, after a lot of use, enough metal burns off the tip to change the resistance and that’s when you replace the tip with a new one.
Guns last a long time. I have two, one of which I got in high school, and the other comes from the Safeguard anti ballistic missile program, which was a long time ago. Your father’s soldering gun[s] will most likely work just fine. You might treat them to new tips.
As far as soldering all the rail joiners, I don’t, for fear that shrinkage or swelling, warp or wind of the wooden bench work could throw the track out of gauge. Train room humidity changes a lot when heating season arrives, and a change in humidity will make wood shrink or swell. I don’t rely on rail joiners to carry electricity, I run a power bus wire under the layout and solder feeders to the track every so often. In principle you solder feedes to every piece
Ray’s answer to this one above should have had the Mythbusters “Warning Science Content” plate at the beginning.
The technique is one I learned years ago in the Air Force, their High Reliabilty Soldering course. That little bubble of solder on the iron tip acts as a heat transfer, remembering that the metals being joined have to get hot enough to melt the solder. The bubble of solder, being molten, will shape to the joint and make the heat transfer faster by bringing the heat source into contact with a larger area of the joint. Once the flux vaporizes (don’t breathe the fumes) the solder flows into the joint area. Just before touching the iron to the joint, I usually start a slow exhale across the joint, that way the flux fumes blow away from me.
Solder does have to touch the tip. What you remember hearing was probably just a small part of the rule for making large solder joints. Tinning and cleaning the tip are also important to keeping the soldering iron in good shape and ready to go. Most soldering iron stands and all soldering stations have a small tray for a sponge. This sponge is to be kept wet while you’re working with the iron, and after each joint, I do a quick wipe of the tip over the sponge to remove any flux residue from the tip. While wo
Ray’s answer to this one above should have had the Mythbusters “Warning Science Content” plate at the beginning.
The technique is one I learned years ago in the Air Force, their High Reliabilty Soldering course. That little bubble of solder on the iron tip acts as a heat transfer, remembering that the metals being joined have to get hot enough to melt the solder. The bubble of solder, being molten, will shape to the joint and make the heat transfer faster by bringing the heat source into contact with a larger area of the joint. Once the flux vaporizes (don’t breathe the fumes) the solder flows into the joint area. Just before touching the iron to the joint, I usually start a slow exhale across the joint, that way the flux fumes blow away from me.
Solder does have to touch the tip. What you remember hearing was probably just a small part of the rule for making large solder joints. Tinning and cleaning the tip are also important to keeping the soldering iron in good shape and ready to go. Most soldering iron stands and all soldering stations have a small tray for a sponge. This sponge is to be kept wet while you’re working with the iron, and after each joint, I do a quick wipe of the tip over the sponge to remove any flux residue fr
For model railroading work you want rosin flux. It’s a dark brown greasy stickum, comes in little metal cans. Kester and NoCorrode are two brand names. It’s intended for electrical and electronic work. The active ingredient is dispersed in the rosin and only activates and bites into the work when the rosin is melted by the heat of the soldering iron. When cool and solid it’s inactive. The flux makers claim that rosin flux residues are non corrosive and don’t need to be cleaned off.
In the printed circuit business we always washed the flux off the boards after soldering. The only solvent that could cut rosin flux was Freon. Some years ago it was declared that Freon was destroying the ozone layer and the raw sunlight, unfiltered by the ozone layer, would kill us all. So, with a lot of grumbling, the industry went over to “water wash” fluxes, which don’t flux as well, but you can get them off with hot water and soap.
I don’t bother to de flux model railroad joints, and I have never had a joint corrode on me. But I do use flux sparingly, just enough to get the joint to solder well.
Plumbers used to use acid flux (often liquid, came in glass jars) for soldering copper tubing. Acid flux is too strong for electrical work, it eats too much copper, and it keeps eating it. The standard rule was never ever use acid flux for any k
For flux, I have been using the rosin flux pen available at Micro-Mark. Seems to work very nicely. My Father in Law gave me a small tin of No-Corrode 40 years ago. I had been using that until last year and have done several thousand solder joints with it so, yes, a little goes a long way.
Everyone, Thanks to reading the responses on this thread, I tackled a soldering job this past weekend with renewed confidence. A soldered track joint had become misaligned vertically and was causing locos to stutter as they crossed it. I desoldered the joint, realigned it and crimped the rail joiner, then resoldered it with excellent results. The joint is smooth, trains run great, and visually I can tell this is a better soldering job than the ones I did last year.
I also switched from a 25-watt pointed tip iron to a 40-watt chisel tip iron–wow what a difference! The joint heted up immediately and the solder flowed beautifully. I did not need to use any flux, but I did discover that a desoldering wick works nicely for this kind of job.
