The Difference Between AC Welding and DC Welding

AC and DC welding​ are arcs that use different currents to produce an arc forms of welding. These types of welding involve the creation of an electric arc between the electrode and the metal being welded. The arc provides heat to fuse the metal together. The power source is used to generate the arc and can be AC or DC. The choice of power source (AC or DC) determines the polarity of the current flowing through the electrodes. The power source used also affects the production of the weld.

DC Welding

DC stands for direct current, which flows in one direction. With DC welding, a stable arc is produced because the magnetic field and current of the arc are constant. And because the circuit must be continuous for the current to flow, we use a grounding clamp and electrode holder or TIG/MIG torch to complete the circuit. The arc jumps between the electrode and the metal with the grounding clip attached to complete the circuit. 

Due to the resistance of the metal, the electrode and the metal are heated to the melting point. However, choosing the wrong polarity can significantly reduce the quality of the weld.

Therefore, your ground clamp and electrode must be properly connected to the power source (welder). Each welding process requires a specific polarity, depending on the weld metal and electrode selection.

DC Electrode Positive ("DCEP") - The ground clamp is negative and the electrode is positive. The electrode receives approximately 70% of the heat and 30% of the work. 

DC Electrode Negative ("DCEN") - The ground clamp is positive and the electrode is negative. The electrode receives approximately 30% of the heat and 70% of the work.


Advantages

Smoother welding output compared to AC power.

More stable arc.

Reduced spatter.

DC negative electrode provides faster deposition rates when welding thin metal sheets.

DC positive electrode provides greater penetration of weld metal.


Applications

DC welding is ideal for joining thinner metals and can also be used for most stick welding applications, including TIG welding of steel. This form of welding is also suitable for overhead and vertical applications.


AC Welding

AC is a current that reverses direction many times per second. 60 Hz of current changes its polarity 120 times per second. In AC welding, there is no net deflection of the arc because the magnetic field and current are rapidly reversed.


Advantages

Alternating current between positive and negative polarity allows for a more stable arc for welding magnetic parts.

Fixes the problem of arc blowing.

Enables effective aluminum welding.

AC welding machines are cheaper than DC equipment.


Applications

When switching to AC positive, it also helps to remove oxides from the metal surface - making it suitable for welding aluminum.

AC welding is also widely used in shipbuilding, especially seam welding, because it is able to set the current higher than DC. AC welding also provides fast filler and is used to weld thick plates underhand.

One of the main uses of AC welding is the use of magnetized materials. This allows it to be used to repair machinery. 

Are you interested in learning more about welding machine and how they can benefit you? Contact us today to secure an expert consultation!

评论

发表评论

此博客中的热门博文

Heat Pumps for Domestic Hot Water: A Sustainable Solution

图片
 In the pursuit of sustainable and energy-efficient technologies,  Domestic Hot Water Heat Pump  have emerged as versatile systems with the potential to revolutionize the way we heat our homes. While they are commonly associated with space heating and cooling, one question arises: Can heat pumps be effectively utilized for domestic hot water as well?  Most homeowners who have heat pumps use them to heat and cool their homes. But a heat pump also can be used to heat water -- either as stand-alone water heating system, or as combination water heating and space conditioning system. Understanding Heat Pumps Before delving into their application for domestic hot water, it's essential to grasp the fundamentals of how heat pumps operate. Heat pumps work by transferring heat from one location to another, making use of a refrigerant and a cycle of evaporation and condensation. This process enables them to extract heat from the air, ground, or water, and then deliver it to the...
阅读全文

High-Pressure Slurry Pump Explained

图片
  Welcome to the world of   high pressure slurry pump , where power meets precision. In this article, we delve into the intricacies of these robust machines, exploring their applications, benefits, and everything in between. If you're navigating the landscape of pumping solutions, this guide is your compass. High-Pressure Slurry Pump Explained What is a High-Pressure Slurry Pump? Embark on a journey to understand the core functionality of high-pressure slurry pumps. These mechanical marvels are designed to handle abrasive slurries with ease, making them indispensable in various industries. Applications Across Industries Explore the diverse applications of  slurry pumps , from mining operations to wastewater treatment plants. Their versatility and reliability make them a go-to solution in challenging environments. The Inner Workings Delve into the intricate details of how high-pressure slurry pumps operate. Understanding their mechanisms sheds light on why they are the pre...
阅读全文

Advantages of Using an Automatic Leather Cutting Machine in Car Mat Manufacturing

图片
  In the ever-evolving landscape of manufacturing, precision and efficiency are paramount. When it comes to crafting car mats, the use of cutting-edge technology can make all the difference. One such technological marvel that has revolutionized the car mat manufacturing industry is the   Automatic Leather Cutting Machine ​. In this article, we delve into the manifold advantages of incorporating this state-of-the-art equipment into your production process. Enhanced Precision and Accuracy When it comes to manufacturing car mats, precision is non-negotiable. Each car mat needs to fit seamlessly into the designated vehicle model, ensuring a snug and tailored appearance. Automatic Leather Cutting Machines excel in this aspect, offering a level of precision that is unmatched by traditional cutting methods. These machines utilize advanced software and laser-guided technology to cut leather with extraordinary accuracy. Whether it's intricate patterns or complex designs, the Autom...
阅读全文