FCAW Welding
Flux core arc welding was introduced in the 1950’s. Technically the introduction of this process was not new. It was just a new type of an electrode that can be used on a MIG welding machine. Flux cored arc welding is a process similar to MIG welding. Both processes using continues wire feeds, and similar equipment. The power supply for a FCAW, and a MIG welder, are the same machine. They are both considered semi automatic processes, and have a very high production rate.
The main difference between flux cored arc welding and MIG welding is the way the electrode is shielded from the air. Flux cored arc welding just like the name implies, has a hollow wire with flux in the center, similar to the candy called “pixy sticks”. Just as the name states, a “Flux Core”. The main difference between MIG welding and flux core arc welding is, FCAW gets its shielding from the flux core, and this allows the operator to weld outdoors where it is windy. It’s like a SMAW welding electrode turned inside out! MIG welding gets its shielding from a bottle of gas which has serious draw backs, when welding outdoors, or in drafty conditions.
Flux Cored Arc Welding Production
Flux cored arc welding is the most productive of the manual welding processes! When comparing MIG welding to flux core arc welding, there is a huge gap in production, in the amount of weld per hour. A MIG welder can typically produce 5 to 8 pounds of weld per hour, verses a FCA welder packing 25 plus pounds of weld per hour. On top of that flux core welding can weld 1/2" plates in a single pass with full penetration on both sides.
Flux core arc welding for this reason is primarily used in the ship building industry. Ships are made of heavy plate, and have endless amounts of welding that needs to be done. Flux core welding produces high quality welds, fast, and even when in windy conditions.
Weld ability of Metals
Welding with flux core electrodes has some serious cons when it comes to the weld ability of metals. So far, FCAW has been perfected on most carbon steels, cast iron, nickel based alloys, and some stainless steels. Unfortunately most non ferrous exotic metals cannot be welded and that includes aluminum. On the upside for most hobbyists the flux core electrode may be an excellent choice for general garage work,
because if used in a MIG welder there is no shielding gas required on some electrodes.
How Flux Cored Arc Welding Works
Flux cored arc welding just like MIG welding requires three main ingredients, electricity, filler metal, and a form of shielding from the air. Just like MIG welding, flux core welding works by feeding an electrode continuously to the joint. First the welder squeezes the trigger, and then the wire feeder begins to feed the electrode to the joint, at the same time the electrode gets electrically charged.
Once the electrode hits the metal joint, the electricity short circuits, and heats up the electrode till the electrode begins to melt. Once the electrode begins to melt, the metal also starts to melt, and then both of them start to create a puddle. This puddle at the same time melts the flux core, creating a shield from air, and at the same time produces a slag that protects the weld from contamination.
Date: 2023-04-10 hits: 532 Return
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