Welding is a metal joining process in which two pieces of metal, touching each other, are melted at the edges by a welding gun to fuse them together. When the metals cool down, a strong bond is created. Welding can be done by using either pressure or by using a filler material. The heat can be provided by an electric arc, a gas flame, laser, electron beam, ultrasound, the electrical resistance of the metals or through a chemical reaction. There are different types of welding processes such as spot welding, mig welding, tig welding, seam welding, projection welding, gas welding, resistance welding, induction welding, thermal welding, and forge welding, etc. Welding rods and electrodes are used in welding.
Almost all types of metals such as: iron, steel, aluminum, brass, nickel, phosphor bronze, and tantalum, etc. can be welded by at least one of the processes. Some types of thermoplastics can also be welded. However, you need to make sure you weld the right metal and use the proper filler material as not all metals are suitable for welding, and not all fillers will work with every type of metal.
The quality of a weld depends on the welding method used, the base material, the filler material, the design of the joint, and the amount and concentration of the heat. A good weld is generally judged by its strength. There is a variety of codes and specifications to help welders use the proper techniques and to inspect the welding quality.
The process of welding is universally used in many types of industries and is commonly found in the making of automobiles, ships, creating small to large electrical components, sheet metal applications, and joining together broken pieces of metals, etc. Welding can even be done underwater and in space by using the right processes and equipment. Post welding processes may include stress relieving and removing the extra weld spots with a grinding wheel.
Adequate eye and hand protection is a must while you are welding as looking at the welding zone without dark protective glasses can lead to blindness. You also need to wear the right protective clothing when you are welding as it can be very dangerous. When welding, you should wear safety goggles and a facemask with a dark faceplate to protect you from the ultraviolet rays. If you are welding in a populated area then you should use a welding to protect bystanders from the light and the sparks. You also need adequate ventilation when welding to protect yourself against dangerous gases that may be produced during the welding process. The risk of fire risk can be cut down if you can limit the amount of oxygen in the air and by keeping flammable objects out of your work area.