Burning joints

from Wikipedia, the free encyclopedia

Burning grooves is a special process of flame cutting and therefore a thermal cutting process. The aim is to change the shape of a solid body by breaking the local cohesion. A flame cutter with a special nozzle is used, which is inclined approx. 30 ° to the workpiece surface. The material to be cut is heated to ignition temperature and burned. The largest part is blown out in the working direction. When the energy source is moved, a joint is created. In addition, informal by-products such as dust, melt and vapors are created.

Suitable materials are unalloyed or low-alloy steels, but essentially it depends on the carbon content. Up to 0.25% carbon content, burning joints are possible without preheating, up to 1.6% carbon content the material must be preheated. Chromium, nickel and molybdenum have a negative effect, while manganese has a beneficial effect. Suitable workpiece thickness 0.2–30 mm.

The process is used to prepare or post-process weld seams . Roots are reworked, special seam shapes prepared and defects in weld seams processed. If the weld seams are defective, areas are burned out and re-welded.