[MW:21789] Crack observed during tack welding

Dear Experts,
We are observing crqcks during. Tack welding for setup between material casting. BS3100 Gr A4
And D 40 S.
Electrode using is. E8018-C1 and preheat is 150 degree and also. Done postheating because of repeatedly observing cracks again and again
Pls give your suggestions to avoid cracks.
Best Regards,
Mohit Aggarwal..

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