What is true about the removal of heavy glass deposits before welding?

Regarding the removal of heavy glass deposits before welding, the correct answer highlights that such removal is typically required when specified by the company. This approach aligns with industry practices where certain companies may have specific requirements in their quality control procedures that dictate the necessity of removing heavy glass deposits to ensure the quality and integrity of the weld.

Heavy glass deposits can affect the quality of the weld, potentially leading to issues such as inclusions or poor fusion. However, not every scenario mandates their removal, making it vital to follow the specific instructions provided by the company or applicable standards. This ensures that the welding process adheres to the required quality expectations, safety procedures, and project specifications.

In contrast, the other options present absolute or conditional statements that do not encompass the flexibility often found in welding operations. The notion that heavy glass deposits must always be removed overlooks instances where the welding procedure is designed to accommodate them. Similarly, the idea that removal is only necessary with automatic welding contradicts the standard practices across various welding processes. Lastly, the suggestion that deposits should not be removed at all fails to recognize the potential issues that could arise from their presence, underscoring the importance of judgment based on company directives.