Brazing Welding:
Brazing welding refers to a process in which steel parts are bonded by blister or brass fittings. The equipment used for this process is the same as ordinary bricks, with the difference that it requires welding at a boiling point. It is usually supplied by burning acetylene gas. Since there is no capillary motion, this name has given to this process.
Some advantages of Baizing welding rather than conventional fusion welding are as follows:
Brazing welding allows for the connection of non-homogeneous metals, does not require high precursors, and also the deformation caused by the high temperature does not occur.
Different types of laser welding
1-directional welding
2-Intrusive or key-hole welding
The main difference in these two states is that, in the first case, the surface of the weld region is not broken, and in the case of welding, the surface of the weld region opens to allow the laser beam penetrate into the molten region.
As to the lack of laser penetration into the material, the conductive welding mode makes less concern. So, directional welding is less susceptible to gas absorption during welding. In the inertial welding, non-inoculated closure of key hole results in the appearing of porosity in the weld. Directional and penetrating states in point welding are converted to each other, which depends strongly on the peak power of the laser and the width of the pulse.
The laser hole is usually used for steel at an approximate power density. In such a situation, the welds are shallow and wide. But in the density of deep and thinner bouts of power, which requires less interaction time, it allows welding at a faster rate. Since laser welding is a high-energy method, it does not need to direct heat to deep penetration, and this is in contrast to conventional methods of arc and gas welding which can be achieved through heat conduction.
In directional mode, isotherm circuits are uniformly spaced with the same distance from the source. In this case, welding width is usually greater than the depth and input energy is more than the amount required for penetration. In the perforated or leaky state of the laser, the heat source is transferred from the surface to the material's thickness, and deep and thin weld occurs. In this case, the amount of heat of the input will be minimized.
Keywords: Baizing welding - Possibility of bonding non-homogeneous metals – Non high temperature deformation - directional welding - Intrusive welding - Key hole welding
