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A fully welded door could be overkill in just about every situation
Sometimes, architects request fully welded doors to go along with their fully welded frames (also called "continuously welded"). The fact is, a fully welded door would actually be overkill in just about every situation.
Whether the intent is for aesthetics or strength, a seamless door is the way to go. Manufacturers achieve the seamess appearance by spot welding, filling the seams with body filler, and then grinding it smooth. And as long as the door meets the specified performance level, then the type of welding is irrelevant anyway.
Looking for a sturdy door without exposed edges? Specify a seamless door and the desired performance level from ANSI/SDI A250.8.
Level 1 - Standard-duty
Level 2 - Heavy-duty
Level 3 - Extra Heavy-duty
Level 4 - Maximum-duty