15CrMo weldability

1 welding materials
For the 15CrMo steel welding work characteristics, based on past experience with reference to the welding process card abroad, we

Choose two programs for welding test.
The program Ⅰ: the welding preheat ER80S-B2L wire, TIG welding primer E8018-B2 electrodes, SMAW cover the surface,

Local heat treatment after welding.
Program Ⅱ: ER80S-B2L wire, TIG welding primer E309Mo-16 electrodes, welding rod cover up filled arc welding, after welding

Without heat treatment.
2 welding after heat treatment
The use of the program I welded specimens, local high-temperature tempering after welding. The process of heat treatment: heating rate of

200 ℃ / h, rose to 715 ℃ and incubated for 1 hour and 15 minutes, the cooling rate of 100 ° C / h, followed by air cooling down to 300 ℃. The specific JL-4

Type crawler electric heater
(1146 × 310) surrounding the weld, silicate cotton layer insulation, the insulation thickness 50mm, temperature control DJK-A type electric

Heater automatic temperature control device.
3 welding test results
The pilot programs tensile test Bending test impact toughness test aky (J/cm2)
Tensile strength δb / Mpa fracture site bending angle the surface bend back bend weld fusion line heat-affected zone (the HAZ)
Ⅰ 550/530, the base material 50. Pass Pass 84.8 162 135.6
Program Ⅱ 525/520 base material 50. Pass Pass 79.4 109.2 96.7