×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Welding galvanized steel fittings on steel pipes

Welding galvanized steel fittings on steel pipes

Welding galvanized steel fittings on steel pipes

(OP)
I know that welding galvanized fitting with steel fitting is not recommended , can you tell me why ?

RE: Welding galvanized steel fittings on steel pipes

Welding galvanized pipe shoes and other miscellanous objects to pipe has been done for many, many years.  

The main risk in doing this, is the gas that is created when the zink is burned during the welding process.  This gas can be life threatening.

The zink coating needs to be ground off to create a weld lane.  It would also be wise to have an air flow that blow any stray fumes away from the welder.

RE: Welding galvanized steel fittings on steel pipes

The risk of zinc oxide fume exposure to the welder is secondary to the risk of zinc embrittlement and porosity induced by zinc in the weldment.

Both the OD and ID need to be ground to completely remove zinc before welding.

Be aware that a lot of galvanized fittings are ductile iron rather than carbon steel...

RE: Welding galvanized steel fittings on steel pipes

moltenmetal, aren't they actually malleable iron, not ductile?  

The whole idea of welding threaded components kind of bothers me.

RE: Welding galvanized steel fittings on steel pipes

For your amusement take a look at “Welding Health Hazards,” on the OSHA site: http://www.osha.gov/doc/outreachtraining/htmlfiles/weldhlth.html  If you read through the paragraph labeled Zink, the last sentence is very humorous in the context of the information.    

RE: Welding galvanized steel fittings on steel pipes

I can't believe someone snuck that in!  

RE: Welding galvanized steel fittings on steel pipes


"The subject can then appear to be more susceptible to the onset of this condition on Mondays or on weekdays following a holiday than they are on other days."

What does that NOT include?

BigInchworm-born in the trenches.
http://virtualpipeline.spaces.msn.com

RE: Welding galvanized steel fittings on steel pipes

RossABQ- yep, they're MI, not DI.  Conclusion's the same, though- do not weld!

RE: Welding galvanized steel fittings on steel pipes

What's the problem or humor with the OSHA language?
Of course, the onset of 'metal fever' is more likely on Monday. Tues-Friday, the welder has a continuing case which ameliorates over the weekend.

That page is obsolete. In 1999, the subject list was broadened to: Antimony, Arsenic, Barium, Beryllium Cadmium, Chromium, Cobalt, Copper, Lead, Manganese, Mercury, Nickel, Ozone, Selenium, Silver, Vanadium.
http://www.aws.org/technical/facts/Z49.1-1999-all.pdf

See current standard Ventilation and protection in welding, cutting and heating. - 1915.51 http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=STANDARDS&p_id=10229

Also, in 2006, OSHA issued new, much lower permissible exposure limits (PELs) for hexavalent chromium (which is created in arcs/plasmas from stainless steel, chromium plating & other Cr-containing materials.
http://www.osha.gov/SLTC/hexavalentchromium/
http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=STANDARDS&p_id=13116

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources