This tips will help you make better fabricated products
Attach supporting rod to base plate before wielding
When you wield two plates completely by edge then base plate starts deforming. More technical solution to avoid deformation is to deep the plate in coolant but this solution is not practical for small scale business.
spot wielding rode to base plate will prevent it from deformation. As heat will not be transferred to rode and it will maintain its shape and base plate is spot wielded to rode.
keep the base plate vertical while wielding
When base plate is kept horizontal then it forms more residue. To avoid this if you align the base plate vertical then less residue will be formed. While grinding less residue wield will have better finish than more residue
If you cannot place the plat vertical then keep at slant to a slop but not horizontal.