Alloys for Copper, Brass & Bronze

Copper is a pure metal and can be found naturally in the ground. Copper by itself is soft and ductile and reddish brown in color. When 40% zinc is added to 60% copper, an alloy called brass is made. Copper melts at 1981F. When zinc is added the melting point is lowered to 1650F. This 60-40 brass is very common because it has the highest strength of the copper zinc alloys. When copper is alloyed with tin, the result is bronze. A common bronze is phosphor bronze which is about 10% tin. Copper is noted for its ability to conduct electricity. Based on a scale of 1 to 100, copper is rated at 100 for electrical conductivity. Alloys of copper, such as brass and bronze, have much lower conductivity values, being in the range of about 25. When repair welding of electrical components, the filler alloy used must be considered as to electrical conductivity. Copper is also noted for its thermal conductivity or its ability to conduct heat. This is the reason for using copper for heat exchanger applications such as radiation, air conditioning condensers and evaporators, welding torch tips, etc. This is also the reason large copper parts often seem difficult to weld repair. Welders generally anticipate a certain amount of time when preheating prior to welding and think of the part they are working on as steel, which builds up heat in a local area relatively quickly. Because copper transmits the heat away from the heating area, it takes much longer to bring the weld area up to proper welding temperatures. The welder, thinking steel, starts to weld on a part not sufficiently preheated. The results are poor appearing weld deposits with little or no penetration, weld spatter, and possible surface porosity in the weld. The choice of welding method will usually depend on the type of base metal, its configuration and ultimate use. Arc welding is most popular for heavy sections, while torch is generally used for smaller parts or on copper parts that contain zinc. Brazing can be done successfully on all the copper-base metals. The most popular type of brazing is done with a silver brazing alloy such as Slik-Sil 106. Soldering can be done easily on most copper base alloys if suitable fluxes are used on clean surfaces.
 

 

 
MG 300

Most universal bronze electrode.
Excellent for joining and surfacing.
Ideal for aluminum bronze, steel, brass & copper.
For uses such as: ship propellers, turbines, pump housings, valves, hydraulic equipment, and sculptures.

SDS

Data Sheet

 

 
 
MG 310

AC/DC+ tin/bronze electrode for joining & surfacing.
All position electrode with minimum spatter and easy slag removal.
Excellent color match to bronze.
For uses such as: arc brazing galvanized sheets, defects in new bronze castings, impellers, and gear wheels.

 

SDS

Data Sheet

 

 
 
MG 320

Phosphorus Bronze electrode for applications subjected to frictional wear.
DC reverse polarity (electrode +).
Produces porosity-free deposits in all positions with a minimum amount of spatter.
Slag is easily removable.

 

SDS

Data Sheet

 

 
 
MG 350B

General purpose, bare, low fuming bronze brazing rod.
Production fabrication and maintenance repair of most ferrous and non-ferrous metals.
Ideal for joining parts of metal furniture, bicycles, galvanized ductwork and automobiles.
Use MG 350 Flux.

 

SDS

Data Sheet

 

 
 
MG 350FC

General purpose, flux-coated low-fuming bronze brazing rod.
Economical flux-coated rods eliminate the need for additional fluxes.

 

SDS

Data Sheet

 

 
 
MG 360

General purpose, copper to copper self-fluxing alloy.
Use with Slik-Sil flux for brass or bronze.
Oxy/fuel torch, induction, furnace or any other suitable heat source can be used.
For tight fitting joints (.001 - .003)

 

SDS

Data Sheet

 

 
 
MG 370

Advanced silver alloy for copper or copper alloys.
Self-fluxing for copper-to-copper joints.
Can be used with brass or bronze.
For moderate fitting joints (.002 - .005)

 

SDS

Data Sheet

 

 
 
MG 380

Easy flow phosphorus silver alloy for a wide range of copper and copper alloy brazing.
Self-fluxing for copper to copper brazing.
Alloy can be used for brass or bronze with MG Slik-Sil flux.
Oxy-fuel torch, induction, furnace, or other suitable heat source may be used.
For uses such as: chemical hardware, radiator cores, refrigerators, heat exchangers, copper fittings, and air conditioning.

 

SDS

Data Sheet

 

 
 
MG 382

Low-heat brazing rod for welding most metals.
Joins and builds up on many types of parent metals.
Pre or post-heating is usually not required.
Works well in all positions.
Can also be used as a TIG rod

 

SDS

Data Sheet

 

 
 
MG 390

High purity copper electrode for joining & build-up.
Matches typical copper characteristics of corrosion resistance & thermal/electrical conductivity.
Designed for overlay & fabrication of conventional grades of copper & copper alloys.
For uses such as: electrical installations, deoxidized copper parts & sheets, copper clad steel, and copper clad cast iron.

 

SDS

Data Sheet

 

 
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