Abstract
The mechanism of pressure welding in polycrystalline aluminum, copper, silver and gold was investigated. The role of the oxide film was studied, and it was found that no metal to oxide boning contributes to the strength of the weld. From scanning electron microscope observations a two-stage model has been suggested which could explain the different behavior of the metals studied. The first stage of welding involves the formation of overlapped oxide-free metallic areas. The second stage involves plastic flow of the metal to the overlapped areas and some relative shear displacement at the points where metal cleaned of oxide comes into contact. The different weldability of different metals is attributed to differences in stacking fault energy, hardness ratio, and plastic properties of the oxide.
| Original language | English |
|---|---|
| Pages (from-to) | 302s-310s |
| Journal | Welding Journal (Miami, Fla) |
| Volume | 54 |
| Issue number | 9 |
| State | Published - 1975 |
ASJC Scopus subject areas
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys