Development of equipment and technology for precision air-plasma cutting of plate steel

The authors have investigated the structure of cutting seams obtained after steel 09G2S with a new narrow-jet plasma torch PMVR-5.3 type which has number design features in gas dynamic stabilization system (GDS) arc. To increase efficiency GDS torch, symmetrical input plasma-forming (PFG) into flow division and gas-dynamic stabilizer using two (forming stabilizing) swirlers variable swirl channels were used. It is shown that achieved advantage makes it possible to obtain high quality thickness 40 mm productivity lower energy costs. Analytical methods proved degree precision torch– small cut width, no melting rounding upper edge, as well grate part splashes part, almost zero angular deviation, minimum values surface microrelief width thermal impact zone. Metallographic analysis determination hardness showed presence three subzones zone significant structural changes them. A factors noted influencing revealed formation, elemental composition seam layer during X-ray spectral analysis. Attention drawn cutting, all indicators commensurate machining milling corresponds second class terms cleanliness. was use allows high-quality plate range up or more. However, welding blanks without pre-machining can be carried out more than 20 mm.