求助：BFE和BF加载问题，具体见图片
我用单元生死来模拟焊接过程，用BFE命令进行热源加载，但整个模型计算后各点温度基本一样，用BF命令加载也一样（具体见图）。但用D命令来加载则不会出现以上问题。请大家指点下。加载命令流如下。谢谢/solu
u=d+1 !compute number
p=c
h=2000000
dt1=1e-3
dt=5
t=0
ANTYPE,4
NSUBST,1
AUTOTS,1
LNSRCH,1
NLGEOM,1
NROPT,FULL,,ON !turn on large sharp
OUTRES,ALL,ALL
IC,ALL,TEMP,20
KBC,1
TIMINT,0,STRUCT
TIMINT,1,THERM
TIMINT,0,MAG
TINTP,0.005,,,1,0.5,0.2
nsub1=2
nsub2=20
*DO,i,nse,u,-1 !do down weld
EALIVE,neorder(i)
ESEL,S,LIVE
EPLOT
ESEL,ALL
t=t+dt1
TIME,t
BFE,all,HGEN,1,h !heat source
MPCHG,2,neorder(i) !change material number
SOLVE
t=t+dt1
TIME,t
SOLVE
BFEDELE,all,HGEN !delete heat
t=t+dt-2*dt1
TIME,t
NSUBST,nsub1
SOLVE
*ENDDO
FINISH
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