ARC WELDING PRINCIPLES AND THEORIES

What is Arc Welding? 

Arc welding is a type of welding that uses a welding power supply to create an electric arc between an electrode and the base material to melt the metals at the welding point. They can use either direct (DC) or alternating (AC) current, and consumable or non-consumable electrodes. The welding region is usually protected by some type of shielding gas, vapor, and/or slag. continue..

Robotic Arc Welding 

Robot welding means welding that is performed and controlled by robotic equipment. In general equipment for automatic arc welding is designed differently from that used for manual arc welding. Automatic arc welding normally involves high duty cycles, and the welding equipment must be able to operate under those conditions. In addition, the equipment components must have the necessary features and controls to interface with the main control system. continue..

Welding Basics for You and Me 

In its most basic form, a welder is a device that melts two pieces of metal together using high amperage delivered at the end of an "electrode" (rod) into the work. Although the technology that makes this process happen is technical enough to fill hundreds of pages, I will deliver it to you in simple terms, the same way I learned it in the beginning. Like all new skills, practice will make you proficient, and welding is a skill that anyone can learn. If you have ever had the misfortune to see an electrical short, either from bad wiring, or some type of electrical equipment failure, you will have remembered the zapping sound, puff of smoke and burnt metal that usually follows. This is basically what a welder does, but in a controlled and expected manner.  continue..

Key Concepts in Welding Engineerin 

In arc welding, energy is transferred from the welding electrode to the base metal by an electric arc. When the
welder starts the arc, both the base metal and the filler metal are melted to create the weld. This melting is possible because a sufficient amount of power (energy transferred per unit time) and energy density is supplied to the electrode. continue..

Robot Welding 

Robot welding is a relatively new application of robotics, even though robots were first introduced into US industry during the 1960s. The use of robots in welding did not take off until the 1980s, when the automotive industry began using robots extensively for spot welding. Since then, both the number of robots used in industry and the number of their applications has grown greatly. Cary and Helzer suggest that, as of 2005, more than 120,000 robots are used in North American industry, about half of them pertaining to welding. Growth is primarily limited by high equipment costs, and the resulting restriction to high-production applications. continue..

Electrical Arc Welding Processes 

Electricity ls  the  movement of  electrons along a  corductor.  A  conductor is  a material that allows electrical cunent to  easily pass through it.  Examples of  a conductor ar€ alumioum, brass, copper, gold, silver. A resistor is a material that will allow some electrical current to pass thlough it.  A good example of this is steel, An insulator is a material that  will  !A!  allow  electrical curent  to  pass through it. Examples of insulators are glass, plastic, Iead, etc continue..

Types of Arc Welding 

Carbon Arc Welding. There are two methods of carbon arc welding. In one method no flux is used and in the other method flux either in the form of powder or paste is used to prevent the weld from oxidation. Former method is confined to non-ferrous metals and the later method is usually used for ferrous metals. For this type of welding only dc can be used. Carbon arc welding is used for welding sheet steel, copper alloys, brass, bronze and aluminium. It is not suitable for vertical and overhead welding.  continue..