the current value in the arc welding is decided by the amount of heat input.
the current value in the arc welding is decided by the amount of heat input.
the current value in the arc welding is decided by?
the amount of heat input
to supply the electrical energy necessary for arc welding processes, a number of different power supplies can be used. the most common classification is constant current power supplies and constant voltage power supplies. in arc welding, the voltage is directly related to the length of the arc, and the current is related to the amount of heat input. constant current power supplies are most often used for manual welding processes such as gas tungsten arc welding and shielded metal arc welding, because they maintain a relatively constant current even as the voltage varies. this is important because in manual welding, it can be difficult to hold the electrode perfectly steady, and as a result, the arc length and thus voltage tend to fluctuate. constant voltage power supplies hold the voltage constant and vary the current, and as a result, are most often used for automated welding processes such as gas metal arc welding, flux cored arc welding, and submerged arc welding. in these processes, arc length is kept constant, since any fluctuation in the distance between the wire and the base material is quickly rectified by a large change in current. for example, if the wire and the base material get too close, the current will rapidly increase, which in turn causes the heat to increase and the tip of the wire to melt, returning it to its original separation distance.
arc welding
during the middle of the century, many new welding methods were invented. in 1930, kyle taylor was responsible for the release of stud welding, which soon became popular in shipbuilding and construction. submerged arc welding was invented the same year and continues to be popular today. in 1932 a russian, konstantin khrenov successfully implemented the first underwater electric arc welding. gas tungsten arc welding, after decades of development, was finally perfected in 1941, and gas metal arc welding followed in 1948, allowing for fast welding of non-ferrous materials but requiring expensive shielding gases. shielded metal arc welding was developed during the 1950s, using a flux-coated consumable electrode, and it quickly became the most popular metal arc welding process. in 1957, the flux-cored arc welding process debuted, in which the self-shielded wire electrode could be used with automatic equipment, resulting in greatly increased welding speeds, and that same year, plasma arc welding was invented. electroslag welding was introduced in 1958, and it was followed by its cousin, electrogas welding, in 1961. in 1953, the soviet scientist n. f. kazakov proposed the diffusion bonding method.
welding