Manual arc welding or metal arc welding First developed in the early 20th century, it is often used in welding hobbies. welding workshop Welding repair and maintenance work Welding in the agricultural industry Engineering and manufacturing industry And thanks to this wide range of applications, arc welding has become very popular.
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What is arc welding?
Arc welding is the process of melting two or more metals together. By using a power source from an electric “arc” between the electrode wire and the material being welded. When materials are joined together, they are called metal basins. They are responsible for connecting materials to stick together.
Arc welding is a type of metal welding that uses electricity as a source to create an electric arc between the wire and base metal. The power source can be either direct current (DC) or alternating current (AC), and can be used as both a welding electrode and a welding rod. This type of welding must be equipped with protective equipment against gas, vapor and welder.
This type of welding uses electrode wires or flux-clad metal rods. with the ability to partially burn for gas generation This prevents the motel metal from reacting or contaminating the surrounding air. It also contributes to the stability of the arc as well. The remaining flux melts at the same time and flows through and into the metal basin. The flux then cools and leaves slag which can be removed by prying it with a hammer. and making arc welding more efficient Welders should use sloped welding. Always keep the wire at a 15° angle.
Principle of manual metal arc welding process
Manual metal arc welding uses an electric power source to supply electricity to the welding machine (Power Source) that is a DC welding machine. or alternating current One pole of the welding current is connected to the workpiece. The other terminal will be connected to the welding wire.
It can’t be DCSP or DCRP anymore.
Because he has stopped using it. It’s confusing. I don’t know which one is the polarity. which one is reversed
Currently, there are only DCEN and DCEP.
What will the part be? Or what effect does it have on the connection? Let’s talk later.
Metal arc welding processes beginning with 11 do not use an external shielding gas. and when starting the arc The arc heat will cause the wire and the flux covering the wire to fuse with the workpiece metal. The flux after acting floats up to the surface of the weld. and hardened into slag
Therefore, flux is very important.
Flux or shielding (Flux) is very important in efficiency. and the quality of the weld metal
For example, if you want the weld metal to have a high toughness (Toughness), you must choose a basic flux type (Basic Flux) because it contains deoxidizer elements such as ferrosilicon. and high ferromanganese. The resulting weld metal has high toughness.
Advantages and disadvantages of arc welding
– Arc welding equipment is cheap.
– No gas needed Because the wire used for this type of welding is covered with flux to protect the weld. And it also makes it more portable.
– Arc welding can be very versatile. And wire can be bought in the general market such as cast iron, hard steel, ductile iron and alloys.
– Arc welding creates flux. which needs to be removed from the weld to achieve a smooth and beautiful finish. which may take time
– Arc welding can be difficult on thin metals.
– The length of the rod is limited. This means that you may need a lot of wire depending on the length of metal you are welding.
Tips for arc welding
– Always keep the wire in a dry place.
– If you are not proficient, try to practice welding with scrap metal first. to practice craftsmanship
– Choose the size and type of welding wire to match the workpiece to be welded. (Use the table below as a guide.)