The most versatile brazing method --- automatic flame brazing sharing

​What is automatic flame brazing?

Automatic flame brazing, also known as row gun welding, often adopts multi-nozzle flame or flame tunnel heating mode, and realizes the conversion of assembly positioning, preheating heating, conveying needle injection, cooling, disassembly and other processes through workpiece linear transmission or worktable rotation mode.

Multiple preheating and heating stations can be set as required to heat the workpiece in sections. In order to ensure uniform temperature in the joint area, the welding torch and the heating position of the workpiece on each station should be reasonably configured. If necessary, the welding torch swing or workpiece rotation can be used to achieve uniform heating of the needle welding head.

What are the factors that should be considered in automated flame fiber welding equipment? What is the role of the mechanical system of automated flame brazing equipment?

The automatic flame brazing machine consists of three parts: mechanical system, automatic control system and welding system. Regardless of the equipment used, automated flame brazing equipment must consider the following factors:

① Assembly and loading of the workpiece.

② preset brazing filler metal and flux.

③ Heating mode.

④ Cooling and unloading of brazed parts.

The control system is centered on PLC and equipped with a color man-machine interface to realize automatic control and tracking of the welding process. The control system realizes turntable indexing control, oxygen and gas proportional valve opening control, welding torch swing control, brazing material feeding control, detection and alarm control, etc.

Automatic flame brazing equipment uses oxygen gas (propane or liquefied petroleum gas) system to realize flame brazing. Therefore, the welding system includes oxygen and gas two-way gas system, each system is equipped with pressure switch, flow/pressure controller, proportional valve, sensor, etc.

The welding system is equipped with a liquid flux supply system, which can apply injection through gas flame, with good effect and omit the flux coating process.

In which industries is automated flame brazing used?

The evaporator on the frost-free refrigerator, the evaporator and the condenser on the air conditioner are mostly finned structures composed of copper tubes and aluminum fins, and the large and small U-shaped copper elbows in the structure are connected. Most of them are brazed by an automatic flame needle welding machine with a prefabricated nail ring. The combustible gas of the automatic flame needle welding machine can be acetylene gas, liquefied petroleum gas or propane gas, and propane gas is the best. At the same time, trimethyl borate is brought in by gas as a needle-stitch protector to prevent oxidation and improve the appearance.