Copper tubing solder
"Solder" is an erroneous term as solder mean lead which of course is banned (safe water drinking act) Sweating is another term for "soldering"
Copper can be joined by various alloys such as 95 % tin -5% Anatomy or one of the many silver bearing types of low temperature alloys.
For the strongest possible joints brazing is the best way to go with a tensile strength over 87,000 PSI compared to soft solder joints of 16,000 PSI
For DWV copper joints one can use one of the lead tin solders such as 50 -50 as it is quite easy to work woth.
Copper
actually there are many:solder wicksolder suckersoldering iron and lead bending toolhot air reflow (one of best, can remove devices with hundreds of pins easily)hot barpropane torch and vice-grip pliersetc.
No! Steel is a very bad choice for plumbing, as it rusts and can poison your water. PVC, copper, or clay pipes are recommended for plumbing.
Solder remover is an object or device for removing solder, usually from printed circuit boards. It can be in the form of a copper mesh called solder wick, a separate vacuum device you use alongside a soldering iron, or a desoldering iron. A desoldering iron gets hot like a soldering iron, but the tip is hollow and there is a squeeze bulb mounted on top. So you heat up the solder on the board and then use the bulb to vacuum up the solder and then deposit in a safe place such as a can or ash tray.
In general, the latest recommendations are to use PEX piping over copper even though copper has been the most popular solution for decades now.With the recent increase in copper values, the price of the job to do a full copper install can be much higher than PEX. Also, there are a number of thefts occurring where thieves will go into houses that are only occupied a few months out of the year and strip all of the copper plumbing in order to sell it.PEX plumbing has a lower cost, and is easier to install. In addition to all of these benefits it is also quieter, and does not expand and contract with the temperature like metal does.
If local plumbing code allows it, use it for drain and vent lines.
Lead free only
Copper
What to use to solder a shut off valve
You cannot solder Steel BUT you can braze steel and copper and you can thread steel and then use a copper x female adapter Or finf a steel fitting and use a C x M adapter
"Solder" can be a noun or a verb. The following sentences provide examples of both:You should use lead-free solder for work on kitchen plumbing fixtures.I got Ben to show me how to solder the electronic components in the kit.
When you use soft copper tubing, you flare the end to make the connection. You put a nut on the tube and then flare the end so that it looks like a funnel. Then you can connect the tube to a fitting and when you tighten the nut it compresses the copper and makes a seal.
The quick and easy way is to use a compression "Shark Bite" fitting. It slips onto the copper pipe and creates a tight fit. Then use a threaded or pex flex adapter for your for the connection.Sweat on a male adapter to the copper pipe then just screw on the flex hose. You can also cut the pipe sweat on a tee then use a nipple and male adapter.
=== === By the way I doubt very seriously your using copper pipes your using copper TUBING
no....never use a solvent when working gas lines
Use a lead-free silver solder. It is the only thing that can handle the pressure and bond with the copper pipe.
Your question is listed in "Plumbing" but you are talking about copper wire and a lug ? IF you are asking what type of solder ? The answer would be 60/40 rosin core . Dont use acid flux or large globbs of rosin like in plumbing . How big a lug ?? General electrical, electronic low current or a big car battery terminal ??? General rule is : #1 surfaces must be clean #2 A tight PHYSICAL connection must be made first . #3 Heat the area to be soldered before soldering . Higer grade solder like 50/50 ( more tin) or Silver solder can be used for higher current applications . Lead solder tends to melt easier which is good going on but not so good if your connection is heating up .