- HELP
- Technical Information
- Welded Sheet Metal
- Welding Standards
- Finish Processing Standards
Finish Processing Standards
Finishing Type (Arc Welding, Laser Welding)
Scale Removal Only
- “Burn Mark Removal only” removes weld scale using the specified method. However, for EN 1.0330 equiv.(EN 1.0320 equiv.(hot coiled)), EN 1.0330 equiv. (Electrolytic Zinc Plating), and EN AW−5052 equiv. materials, weld scale embedded deep inside welds cannot be reached by tools and will remain.
- The “Scale Removal Only” finishing method varies by material and is performed using coarse grinding or electrolytic polishing.
・Coarse grinding:
- EN 1.0330 equiv.(EN 1.0320 equiv.(hot coiled)), EN 1.0330 equiv. (Electrolytic Zinc Plating) , and EN AW−5052 equiv. are processed using a grinder.
- Within tool-accessible areas, not only weld burn but also the weld bead area is ground; however, complete flattening of the weld bead is not performed.
- For weld beads and weld burn marks in areas inaccessible to tools, soot removal is performed using a cloth cleaner or similar. If complete flattening of
the weld bead is desired, please select the grinding finish option.
・Electropolished:
EN 1.4301 equiv.(2B), EN 1.4301 equiv.(NO.1), EN 1.4301 equiv.(single-sided #400-grit polished) ,EN 1.4016 equiv.(2B) undergo electrolytic polishing to remove weld burn.
Weld burn treatment targets include the inner weld area. The weld bead itself remains untouched. No overall surface polishing is performed after burn removal treatment.
If you desire surface grinding on the appearance side after burn removal treatment for EN 1.4301 equiv.(single-sided #400-grit polished), please select the grinder finish option.
Grinder Finish
- “Grinder Finish” involves using a grinder to process the weld bead area and weld burn (scale), flattening the weld bead area. However, welded areas recessed
inward are excluded from weld bead flattening because tools cannot reach them. - Furthermore, for EN 1.0330 equiv.(EN 1.0320 equiv.(hot coiled)) and EN AW−5052 equiv., internal weld scale is only addressed by soot removal. For stainless steel materials, internal weld scale is removed by electrolytic polishing.
EN 1.0330 equiv.(EN 1.0320 equiv.(hot coiled))Outer Surface
EN AW−5052 equiv. Outer Surface
EN 1.4301 equiv.(2B) Outer Surface
EN 1.4016 equiv.(2B) Outer Surface
Finishing Areas (Arc Welding, Laser Welding)
- Both burn removal and grinder finishing apply only to weld beads and weld burn marks located on the outer surface of the product. Processing of weld beads
and weld burn marks located on the inner surface of the product cannot be performed where tools cannot reach. - However, for stainless steel materials, weld burn marks associated with weld lines located on the inside are also subject to processing. Flattening of the inner weld bead is not possible.
Finishing Methods by Material and Surface Treatment (Arc Welding, Laser Welding)
Finishing Compatibility Chart by Material and Surface Treatment
| Material | Burn Mark Removal only | Grinder finish | ||||
|---|---|---|---|---|---|---|
|
Outer
Weld scale |
Inner
Weld burn (scale) |
Weld bead residue |
Outer side Weld burn
(scale) |
Inside Weld burn
(scale) |
Weld bead residue | |
|
Grinder processing
(Only near welded
areas) |
Rags, cleaners, etc.
Soot removal |
Outer side:
None Inner
side: Yes |
Grind with a grinder
(Near welded areas
only) |
Cloth cleaner, etc.
Soot removal |
Outer side: None (flat)
Inner side: Yes |
| EN 1.0330 equiv.(EN 1.0320 equiv.(hot coiled)) + Trivalent Chromate(Black) | – | After grinding, polish entire surface | ||||
| EN 1.0330 equiv.(EN 1.0320 equiv.(hot coiled)) + Various painting/Coating | – |
Grind with a grinder
(Only near welded
areas) |
||||
| EN 1.0330 equiv. (Electrolytic Zinc Plating) |
Grinder treatment
(Only near welded
areas) |
Wipes, cleaners, etc.
Soot removal |
Outer side:
None Inner
side: Yes |
– | ||
|
Electropolishing | Electropolishing |
Outer: Yes
Inner: Yes |
Electropolishing | Electropolishing |
Outer: None (Flat)
Inner: Yes |
| EN 1.4301 equiv.(single-sided #400-grit polished) | Electropolished and ground, then buffed to a #400 or higher finish on the visible surface | |||||
| EN AW−5052 equiv. + Various Anodized Finishes |
Grinding
(only near welded
areas) |
Wipes, cleaner, etc.
Soot removal |
Outer: None
Inner: Yes |
Grind with a grinder
(Only near welded
areas) |
Cloth cleaner, etc.
Soot removal |
|
“Bead Residue” Column Legend
・Inside: Present ⇒ Weld bead remains unground (may be ground within tool access range)
・Outer side: None (flat) ⇒ Weld bead has been ground away, not protruding relative to surrounding surface
・Outer: None ⇒ Weld bead has been ground, but flatness relative to surrounding surfaces is not guaranteed
Materials/Surface Treatments Requiring Additional Specific Finishing Methods
・EN 1.4301 equiv.(single-sided #400-grit polished):
- When selecting grinder finish, the visible surface is finished with #400 or higher buff polishing.
EN 1.4301 equiv.(single-sided #400-grit polished) Appearance after grinder finish
・EN 1.0330 equiv.(EN 1.0320 equiv.(hot coiled)) + Trivalent Chromate(Black):
- Only grinder finish is available.
- Similar to other plated products, after grinding finish prior to surface treatment, the entire surface is polished using a double-action sander before plating.
EN 1.0330 equiv.(EN 1.0320 equiv.(hot coiled)) + Trivalent Chromate(Black) Appearance after Grinder Finishing
Spot Weld Finishing Method
- Spot weld finishing is performed using a fixed method based on the material, regardless of the selection in the welding information field.
- For example, even if grinding finish is selected in the welding information indicator field, grinding is not performed on the spot weld marks, so the spot weld marks remain as-is at shipment.
Finishing Methods by Material
- No weld burn removal processing is performed for spot welds; spot weld marks are left as-is for shipment.
- However, weld burn marks caused by temporary fasteners will be processed using a grinder within the range accessible by tools.
・EN 1.0330 equiv. (Electrolytic Zinc Plating):
- No weld burn removal processing is performed for spot welding; products are shipped with spot weld marks remaining. To preserve the coating, no burn removal processing is performed on areas with weld burn caused by
temporary stops.
・EN 1.4301 equiv.(2B), EN 1.4016 equiv.(2B):
- Weld burn marks from spot welding are removed by electrolytic polishing. Products are shipped with the spot weld marks remaining.
・EN AW−5052 equiv.:
No burn removal processing is performed for weld burns associated with spot welding. However, only the area near the spot weld marks is processed with a grinder to ensure no protrusions remain relative to the surrounding area.
None is performed on weld burn marks caused by temporary stops.
