A cheap soft solder which is good for purposes where not much pressure is carried, is made by adding to each pound of lead, while melting, one teaspoonful of common salt. C. L. Scoville.
When soldering, and no acid is handy, a common tallow candle will answer the purpose. John B. Sperry.
The following is a receipt for aluminum solder which we are using with success in the Elwell-Parker Electric Co.'s shop, Cleveland, Ohio. It is the result of experiments made by several of our foremen: Pig tin, 12 ounces; sheet zinc, 3 ounces; mercury, 1 ounce. Melt the zinc first and then add the tin. When the tin is melted remove from the fire and add the mercury while still in the molten state. Be careful to stir the mixture thoroughly before pouring into the mold. Use stearic acid for a flux.
Cleveland, Ohio. L. Miller.
For soldering galvanized iron without scraping use raw muriatic acid.
Philadelphia, Pa. Wm. Davis.
A soldering solution for steel that will not rust or blacken the work is made of 6 ounces alcohol, 2 ounces glycerine and 1 ounce oxide of zinc. A. L. Monrad.
New Haven, Conn.
A good anti-rust solution for soldering metals where acids must not be used, is made by dissolving rosin in acetone, making a solution about as thick as molasses; it is applied in the usual manner.
Birmingham, Eng. W. R. Bowers.
To prepare a soldering acid that will not rust iron, add to a saturated solution of zinc and hydrochloric acid ¼ part ammonia, and dilute the whole with an equal quantity of water. This has been very successfully used on knitting machines in soldering needles to their holders where an acid with the above characteristics is essential. J. H. V.
To make a non-rusting soldering fluid, dissolve small pieces of zinc in hydrochloric acid till effervescence ceases. After standing a day, take out the undissolved zinc, and filter the solution. Then mix with one-third its volume of C. P. ammonia 26 degrees, Beaume, and dilute with water to suit the work to be soldered. This flux does first-class service and does not rust the work. F. E. Whittlesey.
It is often stated that aluminum cannot be readily and successfully soldered to other metals. I have, on numerous occasions, successfully and easily soldered aluminum to both copper and brass by the following method: First tin the aluminum and the copper, or brass, using stearine as a flux; wipe off clean, then use zinc chloride as flux; wipe solder composed of: tin 67 per cent., lead 33 per cent. T.Iles.