1. Welding arc marks
landscape boulders welders can develop rough spots on the metal surface when arcing, damaging the maintenance film and leaving a potential source of corrosion. landscape boulders welders should start the arc on the welded seam or on one side of the welded joint and then apply the lead melt into the weld seam.
Two, rust spots
Rust on landscape boulders manufacturing equipment can sometimes show up in landscape boulders, indicating 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, etc. will not only reduce the firmness of the joint, but may also 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 product and dirt.
5. Oil and Grease
Organic substances such as grease and even fingerprints can be a source of localized corrosion and must be thoroughly removed 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. It is recommended to clean with a clean brush, water or alkaline cleaner, or with high-pressure water or steam.
7. Flux
Flux's landscape boulders welding processes include manual welding, flux cored arc welding, and submerged arc welding. These soldering processes leave fine flux particles on the surface that cannot be removed by normal 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
High-temperature color reversion is formed 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 should thermal tempering and other oxide layers be removed, but also the metal layer beneath the chromium-poor metal layer should be cleaned.
