×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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!

*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

welding galvanized pipes

welding galvanized pipes

welding galvanized pipes

(OP)
Does anybody knows what is the reason that if you have galvanized pipe, you have to have galvanize free end for welding? Is it a quality of weld or it is cancer gasses that are released while welding?

RE: welding galvanized pipes

Both - zinc can adversely affect weld desposit and it will make you sick - forget cancer over the long haul - you will get influenza like symtoms - fever/chills, etc very shortly.

Blacksmith

RE: welding galvanized pipes

blacksmith is correct. "zinc chills" is the name of the health problem. the old is that milk or calcium tablets help but ventilation is best.

Zinc can cause cracking in welds. It is best to remove it first by grinding or burn it off with an oxidizing flame.
Same health problems.

If you must weld over it,try E6010 or perhaps GMAW short arc
with CO2. It may also require a wider root gap.

RE: welding galvanized pipes

(OP)
So, as "deanc" said, there is not just health problem, rather there is weld quality problem, too? Am I right?

RE: welding galvanized pipes

I think for remove galvanized before welded
Because effect with quality of weld seam (as apostolka)
For remove galvanized I think only grinding (As deanc ) if burn  may be take problem with pipe and as “As TheBlacksmith “

RE: welding galvanized pipes

You may want to take a gander at thread 507-49105

RE: welding galvanized pipes

DeanC is perfect with his reply, have witnessed a lot of welding of galvanised gratings on decks for offshore structures using E6010 sucessfully.

RE: welding galvanized pipes

(OP)
Thanks to all of you that replayed. This is realy great way to exchange knowledge.
Thanks again.

RE: welding galvanized pipes

As a consequence of health effects from the Zn fumes, you risk liability to yourself and your company by specifying welding of galvanized material.  It is only safe if proper procedures and equipment are used, and you cannot ensure that employees will wear suitable personal protective equipment at all times.  Some of the methods for producing a sound weld by burning off the zinc coating ahead of the weld produce hazardous fumes. Consequently, you need a procedure for the prior, safe removal of Zn from the weld areas and an inspection to verify the removal (with signature).  Otherwise (& note: welding fumes includes much more than zinc fumes), liability problems, see

"Harm Caused by Welding Fumes Is Receiving Greater Recognition.
Welders who have been harmed by the gases and metal fumes created in the welding process have begun to bring legal actions against various parties, including the companies that provided the welding equipment and supplies, to recover for their injuries.
Over the past 30 years, our team has been responsible for bringing justice and distributing millions of dollars to thousands of clients from class action and individual settlements."
https://www.classactionamerica.com/cases/case.asp?cid=1593
 

RE: welding galvanized pipes

If you must weld over the zinc coating, E6010 or E6012 are recommended by the Navy and AWS.

RE: welding galvanized pipes

Wow!!

I'm glad to learn of the dangers of welding zinc but kenvlach's website is downright SCARY!!!

Yikes!!

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! Already a Member? Login


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close