How To Weld 4140 Alloy Steel. Will the welded joints be subjected to high-impact and abrasive conditions as well. How is 4140 Steel Annealed Hardened and Tampered.
Thats because the composition is so similar. A preheat and interpass temperature of 500F to 700F is generally sufficient. How to harden steel after welding.
AISI 4140 steel must be preheated to avoid the.
Exact furnace controlled temperature is not required a heat crayon will provide adequate guidance. 3 Tempering recommendations from the ASM heat treaters guide for 4140-4142 is a minimum of 400F. Its not recommended to weld 4130 or 4140 steel in the quench and tempered or case-hardened conditions without first performing annealing or normalizing in the area to be welded. When welding 4130 and 4140 steel holding the weldment at the preheat temperature for some time after welding followed by covering the weldment in ceramic insulation is beneficial because this allows the diffusion of hydrogen from the weld metal and the heat-affected zone HAZ.