PCB Circuit Board Welding Tool

PCB circuit board welding main tools: manual welding is an electronic assembly must master the technology, the correct selection of solder and flux, according to the actual situation of choice of tools, is to ensure the quality of the necessary conditions.

Solder: fusion of two or more than two kinds of metal, to become a whole fusible metal or alloy called solder. Commonly used in tin lead solder, tin (62.7%), lead accounted for 37.3%.

The ratio of the solder melting point and freezing point is 183 C can by direct liquid cooling to a solid state, not through the semi liquid solder joints can be solidified rapidly, shortening the welding time and reduce weld, the temperature said for the eutectic point, the composition of solder said eutectic solder.

Eutectic solder has a low melting point, melting point and solidification point, good fluidity, small surface tension, good wettability, high mechanical strength, solder joints can withstand the larger tensile and shear, good conductive properties.

Flux

Flux is a welding auxiliary materials, the role is as follows: l oxide film is removed. L to prevent oxidation. L decrease surface tension. L solder joint appearance.

Commonly used flux is rosin, rosin alcohol flux, solder paste, flux of zinc chloride, ammonium chloride flux. Welding often used center clip rosin flux, tin content for 61% of the 39 tin lead solder wire, also known as rosin solder wire

Selection of welding tools:

General electric irons: ordinary electric iron welding is only suitable for less demanding applications. Such as welding wire, cable and so on.

Constant temperature electric iron: the important characteristics of the constant temperature electric iron is a temperature control device, makes the welding temperature stability, used for welding of PCB board is fine.

Desoldering: Tin suction device is actually a small manual air pump, pressure suction tinware of pressure bar, discharge the suction tinware cavity air; release ceiling tinware pressure rod lock button spring to push the pressure rod quickly return to the in situ, in the solder sucker is formed in the cavity air negative pressure, can suck the molten solder.

Hot air gun: hot air gun, also known as SMD electronic components desoldering station. It is specially used for patch surface mounted electronic components, especially the multi pin SMD IC soldering and dismounting. Recommended tripod BGA welding table adopts imported hot air gun, and cheap.