welding galvanized pipes 1

[apostolka]

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?

 

[TheBlacksmith]

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

 

[deanc]

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.

 

[apostolka]

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

 

[jumbo33]

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 “

 

[dik]

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

 

[sayee1]

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

 

[apostolka]

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

 

[kenvlach]

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

 

[stanweld]

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

 

[Binary]

Wow!!

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

Yikes!!