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Weld-on hinges are just what the name implies, hinges that are designed to be attached by welding them into position instead of using screws.
HINGE MATERIALS
The quality of door hinges is determined by the way they are produced. Stamped hinges are low-cost, made of thinner material and considered residential grade. Extruded hinges could either be residential grade or higher-quality architectural grade hinges. Hand-cast bronze door hinges would always be considered architectural grade. Choices for construction materials for industrial hinges include aluminum, brass, bronze, steel, and stainless steel.
PINS AND TIPS
The pins of the hinge may be constructed from alternative materials of the main body and these include aluminum, brass, and stainless steel.
The caps or tips (finial) on a hinge can be plain or fancy. Some hinges are designed with the tip fixed in position while others have a separate, replaceable tip. Special sloped tips are designed for hinges used in hospitals. The declining slope prevents anyone from hooking or hanging anything on the tip of the hinge, reducing the possibility of injury or suicide.
FIRE RATED
Hinges used on a fire-rated door must also be fire-rated. You must use steel or stainless steel base material, ball bearing hinges. Brass and bronze hinges will melt under extreme heat causing the door to fall out of the frame.
