The technological process of stainless steel decorative cement columns is:
- Concrete columns forming
- Concrete columns base treatment
- Stainless steel plate rolling
- Stainless steel plate installation and positioning
Forming of concrete columns
In order to facilitate the welding of stainless steel plates in the later stage, copper or steel cooling pads should be embedded and fixed during concrete pouring. Generally, when the thickness of the stainless steel plate used is less than 0.75mm, a backing plate can be embedded on one side of the column. When its thickness is greater than 0.75mm, backing plates should be buried on both sides of the column. The backing plate can use a backing plate with a shallow groove or no groove in the middle. When stainless steel is welded, a large amount of heat is accumulated in its welding heat-affected zone, resulting in welding deformation. Therefore, measures should be taken to reverse deformation during welding. When there is no condition to pre-embed the backing plate, the backing plate should be fixed on the column by a plastering layer (or other methods). In addition, care should be taken to place the pad as much as possible in the secondary line of sight.
Stainless steel plate rolling
Processing the stainless steel plate into the required cylinder is the main link in the production of the stainless steel cladding column. The two commonly used methods are manual rounding and rolling plate machine rounding. Different processing methods can be used for steel plates with different thicknesses. When the thickness of the plate is less than 0.75mm, the manual rounding method can be used to make a circle by using a wooden stick head, a steel pipe, and a support frame. Of course, the quality of the steel plate rolling machine is better. It is generally not easy to roll into a complete cylinder at one time, but it can be rolled into two standard semicircles first, and then welded into a cylinder.
Precautions when installing and positioning stainless steel plates
- The joint position of the steel plate should correspond to the position of the pre-embedded cooling pad on the column base.
- There should be no height difference between the stainless steel plates on both sides of the weld.
- The size of the weld gap should meet the requirements of the welding specification (0-1mm), the unevenness of the plate surface should be corrected as much as possible, and the distance between the welds should be adjusted to ensure good contact at the weld. Finally, the steel plate can be fixed by spot welding or other methods.
For the welding of stainless steel plates with a thickness of less than 2m, considering that the steel plate cylinder does not bear too much load, generally, no grooves are opened, but flat groove butt welding is used. If you want to open the groove, you should make the groove before installation. In order to ensure that the weld metal can be firmly attached and the corrosion resistance of the weld metal will not be lost, both the flat and groove welds should be thoroughly done. Degreasing and cleaning. Another preparation is to fix copper (or steel) pressure plates on both sides of the weld to prevent the deformation of the panels.
From the welding performance of stainless steel, contact welding is the most suitable, followed by fusion welding. From the perspective of practical application and welding technology level, manual arc welding and oxygen acetylene gas welding are mostly selected, but gas welding is suitable for welding stainless steel plates with a thickness of less than 1mm, especially austenitic ones. Manual arc welding is suitable for stainless steel sheet, and the application of finer and smaller current.
When there are not too many dents and coarse sweat beads on the surface of the welding seam, it can be directly polished. Otherwise, it should be ground and trimmed first, and then treated with a polishing machine.