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Area of Application: Arcal Weld-O is a ready-to-use X-Ray quality welding prep for aluminum and all grades of aluminum alloys. Weld-O is an innovative chemical formulation that consists of a blend of mineral acids, surface active and sequestering agents and degreasers.

Weld-O deoxidizes the surface instantly and conditions the surface for X-ray quality welding. The weld joint is cleaner and stronger. By using Weld-O, the need for wire brushing and other time consuming cleanup procedures are eliminated. A simple water rinse may be done but in many cases is not required.


  • Appearance: Clear pink solution with acid odor
  • Specific gravity: 1.1
  • Flash point: none
  • pH: 1 - 2
  • Solubility in water: Soluble
  • Biodegradable: Yes
  • Do not dilute. Use Weld-O as is.
  • With an acid resistant brush such as a flux applicator, apply Weld-O to both sides of the area to be welded to assure a uniform weld joint and to eliminate migration and fusion of contaminants during welding. Leave it on for approximately 60 seconds or until a uniform foam blanket is noticed on the surface.
  • Wipe with a clean sponge or cloth. Then weld in your normal manner to obtain an X-ray quality weld.

CAUTION: This product contains hydrofluoric acid and should be used by qualified professionals utilizing appropriate safety gear.

This information is believed to be authentic and correct as determined by laboratory and field-testing. No warranty or guaranteed results are express or implied due to application circumstances and usage beyond the control of the seller or manufacturer.

Arcal Chemicals, Inc.223 Westhampton Avenue Capitol Heights, MD 20743 Map Tele: 301.336.9300 Fax: 301.336.6597

Copyright Arcal Chemicals, Inc. 2001