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A typical spring-loaded solder sucker A solder sucker partially dismantled showing the spring. A desoldering pump, colloquially known as a solder sucker, is a manually-operated device which is used to remove solder from a printed circuit board. There are two types: the plunger style and bulb style. [1]
It is good practice to remove solder from a joint prior to resoldering — desoldering braids (or wicks) or vacuum desoldering equipment (solder suckers) can be used. Desoldering wicks contain plenty of flux which will remove the oxidation from the copper trace and any device leads that are present.
For example, tin-lead solder [5] attaches very well to copper metal, but poorly to its oxides, which form quickly at soldering temperatures. By preventing the formation of metal oxides, flux enables the solder to adhere to the clean metal surface, rather than forming beads, as it would on an oxidized surface.
Tin-silver-copper (Sn-Ag-Cu, also known as SAC), is a lead-free alloy commonly used for electronic solder. It is the main choice for lead-free surface-mount technology (SMT) assembly in the industry, [ 1 ] as it is near eutectic , with adequate thermal fatigue properties, strength, and wettability. [ 2 ]
Most copper alloys are pickled in dilute sulfuric acid, but brass is pickled in concentrated sulfuric and nitric acid mixed with sodium chloride and soot. [ 1 ] In jewelry making , pickling is used to remove the copper oxide layer that results from heating copper and sterling silver during soldering and annealing.
The process by which copper traces are applied to the surface is known as etching after the subtractive method of the process, though there are also additive and semi-additive methods. Subtractive methods remove copper from an entirely copper-coated board to leave only the desired copper pattern.
It looks like a normal pad with copper "spokes" connecting it to the surrounding copper. A typical pad on a printed circuit board is only connected to a few narrow tracks. A pad directly connected to the copper pour is difficult to solder, since the heat quickly leaks away from the pad into the copper pour due to high thermal conductivity of ...
Soldering copper pipes using a propane torch and a lead-free solder. Solder is a metallic material that is used to connect metal workpieces. The choice of specific solder alloys depends on their melting point, chemical reactivity, mechanical properties, toxicity, and other properties.