Understanding polarity is crucial for becoming an excellent welder. Whether the project has good welding quality and strength depends on the polarity chosen. The polarity can be AC or DC. AC represents alternating current, flowing half the time in one direction and the other half in the other direction. It changes polarity approximately 120 times per second.

DC represents direct current, which means that the current has a constant polarity because it continuously flows in one direction. Simply put, when you look at a welding machine and see a DC label, it indicates that the polarity of the welding machine is constant. If displayed as AC, the polarity will change and the direction will alternate up to 120 times per second.

What is AC welding:

AC welding is the process of welding using alternating current. Welding is not as smooth as DC welding, and although DC welding is usually considered superior to AC welding, in some cases AC is the preferred welding polarity. Some advantages of AC welding are:

AC welding machines have lower prices, but many high-end models offer both AC and DC power.

AC welding is most suitable for welding aluminum, which requires the generation of high-strength heat.

AC welding is specifically used in the shipbuilding industry because it is more suitable for high temperatures and has higher current levels, making it suitable for welding at corners and welds.

The current alternates between positive and negative polarity, making it possible to weld magnetic components. This is particularly important when performing maintenance or repair work on magnetization machines. In addition, repair work usually involves rusted metal, and AC welding is a better choice than DC welding.

AC power reduces arc bias blowing. When the expected arc deviates from its original path, arc deviation occurs.

The drawbacks of AC welding include:

• More splashes. Splash is a hot material droplet that splashes from the weld seam to the floor or around the welding area.

The welding quality is not so smooth.

It is more difficult to handle than DC welding.

What is DC welding:

Direct current flows in only one direction. This welding method has a high deposition rate. The deposition rate is the amount of filler metal melted into the weld seam. The higher deposition rate makes DC welding advantageous for welding that requires deposition. It also has less spatter than AC welding, making the weld bead more uniform and smooth.

Direct current is easier to use because arc welding is more stable than AC welding. Other advantages are:

More stable arc.

The weld seam is smoother.

Faster deposition rate.

Better penetration into weld metal.

Perfect for connecting thinner metals.

It can also be used for rod welding and is suitable for welding various steels.

Suitable for aerial and vertical applications. Vertical welds are required in different industries, mainly in the construction fields of buildings, power plant construction, oil and gas pipelines and accessories, as well as shipyards that require welders to weld large metal structures in vertical positions.

The disadvantages of DC welding are:

Machines are relatively expensive

It cannot solve the arc blowing problem.

The above content introduces the issue of whether UTP welding rods belong to AC welding or DC welding. In addition, ODJ-Tech Global LLCTechnology specializes in selling brand new original imported German UTP welding rods, and promises to sell all products with brand new original imports. At the same time, we provide customers with quotation, selection, product information, and other services. For more product and technical information needs, please go to the official website of Shenzhen Oudejie Technology Co., Ltd. to search for contact information and further inquire and understand.