Brazing alloys and methods of brazing

A method of torch brazing, comprising:

• forming a wire or rod from an alloy comprising, in weight percent:
• 3-7.5% P, 0.6-1.9% Zn, 5-18% Ag, 0-80% Au, 0-10% Sn, 0-5% Ni, and the balance copper in an amount of at least 21.7%;
• placing a tip of the wire or rod in contact with a surface of a joint formed by first and second base metals, wherein the first base metal is a ferrous alloy, nickel, or a nickel alloy, and wherein the second base metal is a ferrous alloy, nickel, a nickel alloy, gold, a gold alloy, silver, a silver alloy, copper, or a copper alloy;
• and
• heating the joint surface using a torch flame and contacting the tip of the wire or rod to the heated joint surface to melt and flow the alloy onto the joint surface and into the joint under capillary action.

A method of brazing, comprising:

• forming a preform from an alloy comprising, in weight percent:
• 3-7.5% P, 0.1-1.9% Zn, 5-18% Ag, 0-80% Au, 0-10% Sn, 0-5% Ni, and the balance copper in an amount of at least 21.7%;
• placing the preform in contact with the surfaces of a joint formed by first and second base metals, wherein the first base metal is a ferrous alloy, nickel, or a nickel alloy, and wherein the second base metal is a ferrous alloy, nickel, a nickel alloy, gold, a gold alloy, silver, a silver alloy, copper, or a copper alloy;
• and
• heating the joint surface to melt and flow the alloy into the joint.