When should you remove the mold cover on Orgo-thermite welds?

The correct choice is to remove the mold cover after packing the bottom of the base. This practice ensures that the mold remains stable and properly positioned during the thermite welding process, which is crucial for achieving a high-quality weld.

When the bottom of the base is packed before removing the mold cover, it helps to secure the integrity of the mold and prevents any movement that could occur if the cover is removed too early. This step contributes to the proper alignment of the weld and ensures that the weld material is properly contained until it has solidified.

Removing the mold cover at this stage also allows for a safer workflow, as it minimizes the risk of exposing hot substances prematurely. Waiting until the bottom is packed also prevents potential defects in the weld that could arise from an unstable mold during the pouring and cooling phases.