Oxide removal in sheet metal processing
Oxide removal in sheet metal processing
During the thermal cutting of sheet metal, oxide layers form on the edges and surfaces in addition to slag. These form through the reaction of the heated material with oxygen and result in an altered, non-metallically pure surface.
Unlike slag, which adheres mechanically as a solidified melt, oxide layers are firmly bonded reaction layers. These are significantly thinner, but adhere over a large area and influence the surface properties of the component.
Oxide removal is a separate process step within edge and surface finishing. The aim is to selectively remove these oxide layers and create a metallically clean, reactive surface condition.
This defined component condition is a prerequisite for stable subsequent processes such as coating or welding, as remaining oxide layers negatively affect adhesion and process reliability.
What are oxide layers and how do they form?
Oxide layers form during the thermal cutting of sheet metal due to the reaction of the heated material with oxygen from the environment. This creates a thin reaction layer that is firmly bonded to the surface and differs significantly from the base material.
During the cutting process, high temperatures are reached at which the material melts and simultaneously oxidizes. This oxidation leads to the formation of iron oxides at the cut edge and adjacent surface areas.
Unlike slag, which adheres in spots as solidified molten metal, the oxide layer is spread across the surface. It is firmly bound and cannot be removed by simple mechanical chipping.
The thickness of the oxide layer depends on process parameters such as temperature, oxygen supply, and cutting speed. Oxyfuel cutting, in particular, produces pronounced oxide layers, while plasma cutting results in thinner, but still adhesive, oxide films.
These oxide layers alter the surface texture and act as a separating layer between the base material and subsequent coating or joining processes.
Why is oxide removal necessary?
Remaining oxide layers on sheet metal components lead to an altered surface structure, which significantly impairs the adhesion and function of subsequent processes.
Particularly in coating processes, oxide layers act as a separating layer between the base material and the coating system. This leads to uneven layer thickness distribution, reduced adhesion, and coating defects along the edges.
Oxide layers also affect process stability during welding, as they negatively alter the melting behavior and wetting of the weld seam. This leads to unstable welding processes and inconsistent joint properties.
Additionally, oxide layers lead to uneven reaction conditions in subsequent processing steps, making reproducible results and stable processes more difficult.
Targeted oxide removal therefore ensures that a metallically clean and reactive surface is created, enabling stable coating, welding and subsequent processes.
Oxide removal from sheet metal parts
Oxide removal is achieved through controlled mechanical material removal, in which the firmly bonded oxide layer is selectively removed from the component surface. The aim is to create a metallically clean and reactive surface without uncontrollably affecting the base material.
In the oxide removal process step
Oxide brushes
Used to uniformly remove oxide layers from edges and surfaces. The defined tool engagement removes the oxide layer while preserving the component geometry.
For large-area applications
Oxide rollers
for use, which establish uniform contact with the component surface and enable reproducible removal of the oxide layer.
Controlled material removal ensures that the oxide layer is completely removed without creating additional surface defects or uneven machining marks.
The result is a uniformly cleaned, metallically clean surface with stable conditions for subsequent processes such as coating, welding or further surface treatment.
Tailored tool solutions are available for targeted oxide removal, which are used depending on the component geometry and requirements.
Oxide removal before coating and welding
Oxide layers act as a separating layer between the base material and subsequent coating or joining processes. If they remain on edges and surfaces, uneven adhesion conditions and unstable process states result.
In coated components, remaining oxide layers lead to reduced adhesion, uneven layer thickness distribution and coating defects in the edge area.
Oxide layers also affect wetting and melting behavior during welding. This can lead to uneven joint properties and reduced process reliability.
Oxide removal creates a metallically clean surface condition, thus forming the basis for stable coating processes, reproducible welding processes and defined subsequent processes.
Oxide removal as the basis for stable subsequent processes
Oxide removal ensures that oxide layers are completely removed and metallically clean surfaces are produced. This is the only way to create stable conditions for coating, welding, and other processing steps.
A defined surface condition enables reproducible results, reduces process variations and ensures quality in further manufacturing.
More about the entire process chain: Edge and surface finishing at a glance
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By customizing our tools for each customer, process times can be significantly reduced. A customer case shows that up to 80 % of processing time can be saved during deburring.
The latest generation of deburring discs maximizes the abrasive surface area thanks to the innovative arrangement and slotted structure of the abrasive flaps, increases material removal at the sheet metal edge and significantly improves the performance of your deburring machine.
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Variable oxide wheel
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FAQ on oxide removal from sheet metal
Answers regarding oxide layers, coating, welding and mechanical oxide removal.
Oxide removal describes the targeted mechanical removal of oxide layers on cut edges and surfaces of sheet metal parts.
The goal is a metallically clean surface condition that enables stable coating, welding and subsequent processes.
Oxide layers form when heated material reacts with oxygen during thermal separation.
Particularly during oxyfuel and plasma cutting, firmly bonded oxide layers can form on cut edges and adjacent surface areas.
Oxide layers alter the surface texture and act as a separating layer between the base material and subsequent coating or joining processes.
Without oxide removal, reduced adhesion, coating defects and unstable welding processes can occur.
Slag is solidified molten metal that adheres mechanically to the surface of the component.
In contrast, an oxide layer is a chemically formed reaction layer that is bonded to the surface over a wide area and must be removed mechanically in a targeted manner.
In the oxide removal process step, oxide brushes are used to selectively remove oxide layers from edges and surfaces.
For surface applications, oxide rollers are used to achieve uniform contact with the component surface and reproducible removal of the oxide layer.
Oxide layers act as a separating layer between the base material and the coating system.
This can lead to reduced adhesion, uneven layer thickness distribution and coating defects in the edge area.
Oxide layers affect the melting behavior and wetting during welding.
If they are not removed before welding, unstable welding processes and uneven joint properties can occur.
Yes. Oxide layers can be removed by controlled mechanical material removal.
The crucial point is that the oxide layer is completely removed without creating additional surface defects or uneven machining marks.
The necessity depends on the cutting process, cutting gas, material and the requirements of the subsequent processes.
Oxide layers are particularly relevant in oxygen-assisted thermal processes. Their removal is often crucial for coating or welding.
The goal is a metallically clean, reactive surface condition without interfering oxide layers.
This defined component condition improves coating capability, weldability and the reproducibility of subsequent processing steps.
