Weld surface cleaning
Prior to coating and/or welding, machined base-metal surfaces are usually degreased by a multiple step procedure. The increase in strength achieved through use of smoother base-metal surfaces is generally attributed to more complete welding from the increased contact area of the laying surfaces.
Weld surface Cleaning
The following method has been used to clean a variety of base metals (for example, type 304 stainless steel, maraging steel, uranium, beryllium, and aluminum) before they undergo subsequent ion-sputter etching and silver interlayer deposition in vacuum:
1. WASH WITH ABRASIVE DETERGENT FOLLOWED BY A HOT-WATER RINSE
2. RINSE IN DEIONIZED WATER
3. ULTRASONICALLY CLEAN IN ETHYL ALCOHOL
4. BLOW DRY USING INERT GAS
For other fabrication methods, such as electrodeposited interlayers or foils, the base metal surfaces are degreased prior to plating or joining to remove organic surface films that would otherwise degrade the metallic bonding at the interlayer/base-metal interfaces.
Weld surface cleaning prior to welding
- Joint strength generally increases with decreasing base-metal surface roughness and flatness.
- This is true for foil interlayers and for coated interlayers, where the surface roughness of the coating generally replicates that of the underlying base-metal surface.
- Table below shows the increases in tensile strengths of silver interlayer welds utilizing lapped base-metal surfaces (0.15 μm, or 6 μin., flatness, 0.03 μm, or 1.2 μin., arithmetic average surface roughness, Ra) over those of machined surfaces (2 μm, or 80 μin., flatness, 0.1 μm, or 4 μin., Ra).
- The increase in strength achieved through use of smoother base-metal surfaces is generally attributed to more complete welding from the increased contact area of the laying surfaces.
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