The welding test on 5 mm 3Cr13Mo martensite heat resistant steel plate (/% ： 0. 28C

0. 8Si

0.36Mn

0. 030S

0.029P

12. 10Cr

0. 57Mo

0.45Ni) with welding speed 0. 5 ~ 1.2 mm/s

current 150 ~ 200 A

pulse width 3. 0 ~5. 0 ms and frequency 18 ~40 Hz by using a 500 W YAG laser has been carried out

and the temperature field

the residual stress and the welding distortion during welding process are numerically simulated by welding model developed and established using large-scale finite element software ABAQUS. Study results show that the calculated values basically coincide with the real measured values

the calculated maximum welding residual stress is concentrated in heat affected ring zone distance from welding seam 0.1 mm

with the process parameters-welding current 150 A

pulse width 3.0 ms

frequency 18 Hz and welding speed 0.5 mm/s

the residual plasticity strain introduced by the maximum residual stress is up to 0.325.