Welding case hardening structural steel
To buy low-carbon alloy steels, subjected to further cementation, at affordable prices manufacturer, the company offers Electrocentury-steel. Supplier guaranteed prompt delivery of products to any destination specified by the user.
The ability of cemented components to welding significantly depends on the percentage content of carbon: if it exceeds 0,25%, in the process of heating the metal during welding increase its hardening characteristics, which leads to the formation of quenching cracks and to improve the level of residual stresses after welding. Such steel after welding, be sure to put the holiday. Performing welding case hardening steels, it is impossible to prevent the appearance of the weld pores, undercuts and other defects. In this regard, we cannot use oven gloves: they are not fully welded, forming a seam of reduced strength. The same limitation applies to the length of the weld, which may not be less than 120…150 mm. and Subsequent jelly defects are also undesirable, because it leads to uncontrolled release of metals.
When multi-layer welding each successive layer is applied only in the case where the weld bead has not yet had time to cool to temperatures of 180 to 200 °C and below.
Low-carbon alloy steels, carburizing past before welding, be sure to warm up to temperatures of 220…260°C; this is especially important when welding steels considered you must run at negative ambient temperatures.
Buy case hardening alloy steels in the range at prices from the manufacturer, the company offers Electrocentury-steel. The provider ensures timely delivery of metal products to any place specified by the customer.
The choice of the type and material of welding electrodes
Despite the fact that all low carbon steels are weldable, the preparation required to use certain brands of welding electrodes:
Welding of low alloy case hardening steel is preferably carried out using electrodes of grades e-42 e-46, which have a rutile coating;
For welding mild steels vysokogornyh electrodes are used brands of e-42A with floristically coating, and the electrodes SSSI-13 OZS-2;
If welded case hardening steel will continue to be operated in high wear applications, it is advisable to apply welding electrodes brands T-590 and T-620. This ensures the highest hardness in the zone of the weld;
Case hardening of the product, who will work in conditions of high dynamic and shock loads — Cams of the camshafts, plates, tappets, etc. are welded with use of welding electrodes type STP-400 and CPU-4.
If case hardening layer depth is small, then before welding it is recommended to soshlifovat.
The company Electrocentury-steel offers at affordable prices manufacturer of rolled structural alloy steel, suitable for subsequent cementation. The provider ensures timely delivery of products to address its customers.