Guy Audette: You do have a greater problem than most of us here
in the States since you have to interchange with two languages
and the terms used in both do not have the same meaning. I will
try to set down my understanding of the terms you’ve listed and
hope that it will at least provide you with a jumping off point.
If further clarification is necessary please feel free to E-mail
Terminology can indeed get in the way accurate communication
when attempting to explain the various way in which we join
metals together. In general, both silversmiths and jewelers call
the process “SOLDERING”. However,according to Handy and Harmon,
that term is incorrect. If metals are joined using heat at
temperatures above 1100F it is properly called “brazing” Metals
joined below 800F is termed “soldering”
But the term soldering is in such common usage, that, when we
refer to metal joining in our field,we mean joining at temp.
above 1100*F. The more technical term would be brazing.
Soldering is the joining of metals with the use of a
metal(usually an alloy of the metals we are joining)which we
call solder, and the application of heat. At the temperatures
discussed the grain bounadries of the metals to be joined are
opened up and the filler metal(solder) penetrates those
boundaries without fusion of the base metals.
Fusing is the joining of parts by bringing their contacting
surfaces to a molten state with heat so that they join each
other by penetration of their atoms without the use of an
intermediary metal such as solder. A common example is the
fusion of a bezel when doing granulation.
Welding is a fusion process in which the welding rod (filler
rod) and the two edges of the joint are melted together to
become one. Not a jewelry procedure.
Spelter is an alloy of brass and is used as a solder for
non-precious metals such as steel and brass. (To add to the
confusion) this process is also called brazing, but the
procedure also requires temperatures above that which is used
for so called soft soldering.
Note: When using soft solder, you cannot flush grind the solder
without materially weakening the join, since soft solder, unlike
hard silver solder, does not penetrate the grain structure of the
metals being joined.
I hope I haven't added to the confusion and in some small way
there has been some clarification. J.Z.Dule