The basic definition of a welding machine involves a machine that melts metal and fuses it to another object. The main difference between welding machines and other types of metalworking machines is that they both use a similar set of electrodes. A welding machine can be either manual or automatic. Regardless of its type, there are certain features you should look for. Let’s explore the various types of welding machines and their uses. Listed below are some of the most common types.
A projection welder is a spot/projection machine that has a transformer powering the welding current and a projection load of around 450 kgcm-2. This technique is limited to Charpy-type specimens and has several phases. In most cases, the insert pieces are chilled during the welding process and display similar behavior to other types of welds. A weld that is completely porosity-free will require oversized end tabs for alignment purposes and final machining.
Another difference between welding machines and other types of metalworking is the shielding gas. The shielding gas protects the metal joint from reactions by preventing oxygen and other gases from coming into contact with the weld pool. Gases used in welding include argon, carbon dioxide, and helium. Sometimes, the electrode is coated with flux, which releases shielding gas when it melts. The weld tool and the machine can both be filled with shielding gas.