Most copper alloys are Tin and tin-lead alloys, as well as other commonly used in low-temperature solders alloys welding for electrical and electronic applications. Ratio related to welding capability in the system shows that, for a specific flow, it outlines the performance characteristics of Tin and solder layers and related capacity to eliminate any dirt on the material.
　　Internal welding performance is usually decided by the Visual checks of samples (after the military standard and the United States Association of material), it is usually melted and dip solder after a specific time. First completely wetting by solders, and three levels of welding for only 50% was soaked (residues shown in welded thin films of Cu-Sn alloy on intermetallic compounds). Welding performance in more than three levels or better alloys suitable for most application connectors. Electronic intrusion ranging from a modest amount of solvent in resins (such as r-type) to gradually have activated (RMA). And we expect the same exploits more solder will result in better performance levels.
　　Solder and flux is applied to the copper alloy cast products to ensure that product is manufactured of the materials have good weldability and stay for quite some time and provide corrosion resistance. Now can produce different kinds of cast products: these products are mechanical friction or air knife to cut a path of melting, like plating and return (oil immersion by heat or high temperature melting). Each cast product with its own internal characteristics of metal thickness (from the underlying reaction of the alloy of copper and Tin), alloy license manufacturing of the thickness of a border thickness and tolerance.
　　Storage at room temperature, even after being punched does not have internal tin plating of cast metal stage after a month will generate 20~30 Micron thickness of metal layers. Internal metal form also suggests lower castings, alloyed with Tin or flux between a metal atom diffusion. Spread to the surface of alloy constituents such as sulfur or oxygen, and when these components react when generating the resist film, alloy diffusion will bring down the welding properties of castings. Some alloy components are likely to spread to the formation reactions, such as zinc alloy surfaces and thin films. Test Steam-aging and high temperature baking Tin is used to determine casting quality. Increasing contact resistance and weldability of decline are internal diffusion and reaction of alloy composition and atmosphere around the results.