Heavy forging equipment requires regular upkeep. In this video, the maintenance process for a power hammer is demonstrated.

First, welding began to replace riveting in ship-and plane-building (TIME. Dec. 15). Now cast steel is replacing forged steel, and in tanks it is replacing both riveted and welded armor plate.

This section of the industry may be classified as jobbing with quantities generally small varying from one off to perhaps 100 off. Tooling for producing open die work may consist of flat or shaped ...