Introduction of Flux-cored arc welding
Flux-cored arc welding (FCAW) is a semiautomatic or automatic welding method in which the molten electrode is a metal tube, filled inside with a solder with similar functionality. The same as the welding rod cover. FCAW welding usually uses a permanent or sometimes constant current source of supply. FCAW welding is sometimes used for protective gas supply, but usually the core of the welding wire itself provides a protective environment for the welding puddle. FCAW welding has high maneuverability and welding speed which is therefore commonly used in the construction industry.
– Compared to manual arc welding: Continuous arc maintenance, higher embossing speed, no loss of welding rod tip, overcoming the drawbacks related to skill and fatigue of the welder, level Low splashing, improved weld surface appearance (due to the stabilization of the arc and the slag in the drug component).
– There are two types of FCAW. An unnecessary supply of protective gas due to the presence of compounds in the solder that helps to create a protective environment for the weld. With this type of equipment the mobility of the equipment is high, and the device can work in windy areas.
– FCAW also includes another type that requires a protective gas supply. This type has the advantage of low gas consumption protection compared to solid weld. High labor productivity is better with good welds and fewer defects than welding and MIG / MAG welding.
– Equipment is more complex and expensive than manual arc welding, as well as MIG / MAG welding.
– Set the mode and control more complex.
– Smoke welding more, need good ventilation in the welding workshop.
– For non-need gas protection. It takes time to clean the slag. It also requires highly skilled performers.
– Commonly used with alloys: carbon steel and low alloy, stainless steel, nickel steel.
– Offshore drilling rig structures, oil pipelines, liquefied gas tanks.
– Steel skyscraper assembly (114, self-shielding wire).
– Manufacture of aluminum beams, heat exchangers of thermal power plants.
– Heavy-duty construction: bulldozer frame, bucket, gear box, crane, undercarriage.
– Large capacity welding (114, self-protection wire): blast furnace feeder, grinder …
The core electrode arc welding was developed in the 1950s to replace the traditional manual arc welding method by overcoming the weaknesses of manual arc welding.