1. Welding arc marks
The welder will form rough spots on the metal surface when arcing, damage the maintenance film, and leave a potential source of corrosion. The welder should start the arc on the welded weld or on the side of the welded joint, and then melt the lead trace into the weld. in the seam.
2. rust spots
Rust on
Stone Garden Decor manufacturing equipment sometimes appears on stone garden decor, and the
stone sculpture indicate a contaminated exterior. Before the equipment is put into use, rust removal treatment must be carried out, and the fully classified appearance should be inspected by iron test or water test.
3. Disadvantages of welding
Disadvantages of welding: such as undercut, incomplete penetration, dense pores and cracks will not only reduce the firmness of the joint, but also may become a corrosion source of crevice corrosion. They also retain solid particles while cleaning. These shortcomings can be repaired by welding or re-welding after grinding.
4. Scratches
Mechanical cleaning of scratches and other rough surfaces is necessary to avoid build-up of process lubricants or products and dirt. Stone Garden Decor
5. Oil and Grease
Organic substances such as grease and even fingerprints can be a source of localized corrosion and must be thoroughly cleaned as these substances act as a barrier to chemical and electrochemical finishing.
6. Paint, chalk and symbol printing
The effect of these pollutants is similar to that of oil and grease.
stone carving manufacturers recommend cleaning with a clean brush, water or alkaline cleaners, or high-pressure water or steam.
7. Flux
Flux welding processes include manual welding, flux cored arc welding, and submerged arc welding. These welding processes will leave fine flux particles on the surface, which cannot be removed by general stone carving cleaning methods. These particles will become a source of corrosion for crevice corrosion. These residual fluxes must be removed by mechanical cleaning.
8. Heating and tempering color and other oxide layers
The high-temperature color reversion of stone carving is formed by keeping it at high temperature for a long time. When any such oxides are present, the chromium content of the metal surface decreases, resulting in reduced corrosion resistance in these areas. In this case, not only thermal tempering and other oxide layers should be removed, but also the metal layer under the chromium-poor metal layer of the stone carving should be cleaned.
