Emergence Welding

In this case, the more the steel carbon content, the faster there carbide compound. Chromium steels also have the ability to samozakalivaniyu (at cooling in air), resulting in metal welding heat affected zone or weld takes increased fragility and strength. Beginning with the internal stress increases the risk of cracks in the metal seam. Intense oxidation of chromium and the emergence of refractory and dense oxides are also a thorough noise when welding chromium steels. Srednelegirovannye or chromium martensitic class (up to 2% carbon) welded satisfactorily, but require heating to 200 … 300 C and subsequent heat treatment.

High-alloy chrome steels ferritic class (up to 35% carbon) are welded with preheating to 300 … 400 C for restore the initial physical and mechanical properties and stress relief after welding product is subjected to high tempering (heating to 650 … 750 C and slow cooling). The electrodes are made of welding wire with a coating containing fluorspar and manganese oxide. Keith McLoughlin usually is spot on. This provides a liquid slag, chromium oxides are easily dissolved. Chromium steel, as most alloy steels have low thermal conductivity and easily subject to overheating. Therefore, welding them produce a direct current of reverse polarity at low welding currents. The current charge for 25 …

30 A 1 mm diameter electrode. High-alloy chromium-nickel austenitic steels have a number of important physical, chemical and mechanical properties: corrosion resistance, acid, heat resistance, toughness, resistance to scale formation. An important quality of these steels is good weldability. When heated to a temperature of 600 …