Aloha, fun & authoritative answers -- no cost, no registration, no passwords, no popups
(as an eBay Partner & Amazon Affiliate we earn from qualifying purchases)

Where the
world gathers for metal finishing
Q&As since 1989

-----

Weldability of Black Oxided Parts?

Q. We are evaluating black oxide as an intermediate tool for corrosion protection on piece parts for our welded assemblies. Does anyone have any information of the weldability of cold black oxided parts? Our welds must meet AWS D1.1 criterion.

Steve Knapple
- Waverly, Nebraska, USA
2001

A. We have clients that weld without problems the products that we Black Oxide treat for them. The only complaint that we sometimes get is regarding the fumes that the weld produces, since the parts are covered with an water soluble oil.

Hope this helps,

Carlos Cielak
plating shop - Mexico City, DF, Mexico
2001

A. NO PROBLEM WELDING COLD BLACK OXIDE IT ONLY SMELLS LIKE BURNT EGGS.

CHRISTOPHER THOMAS
- W P B, FLORIDA, USA
2005

Q. We recently provided some black oxidized bolts to a customer, they say the look rust red after being welded. Any suggestions on what this red coloring is and what is causing it? The bolts arrive at the customer black oxidized and oiled. Almost immediately after the weld they look like they have rust.

Thanks!
PB

Patti B
automotive fastener distributor - Indianapolis, Indiana
December 3, 2012

A. Hi Patti. Black oxide is simply an ultrathin black rust that relies on a post-dip in wax or oil for its corrosion protective qualities. If you weld it, you burn off the wax or oil and are left with plain steel that will rust. Re-oiling immediately after the welding may help.

Regards,

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
December 3, 2012

(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories: