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schathuranga
Active Contributor

Join Date: Mar 2008
Posts: 15

roughness factor for mild steel

04/24/2008 2:58 AM

i calculate and designed a fume extracting system on your help. i used galvanized steel sheet (G18) for calculating the friction loss. i need to know the methods to fabricate duct systems using galvanized sheet.(is Gas welding good?) otherwise mild steel sheet is good because it easy to weld. so please tell the roughness factor for mild steel compare with galvanized steel sheet to multiply the pressure loss i calculated using galvanized sheet.
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Jack Jersawitz
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Join Date: Mar 2008
Location: Atlanta, Georgia
Posts: 749
Good Answers: 13
#1

Re: roughness factor for mild steel

04/25/2008 1:01 AM

So let me be first to ask. What kind of fumes from what kind of production equipment?

One doesn't usually weld sheet metal for such systems; merely bend and crimp.

But more information would be a help to intelligently answer your questions.

j.
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schathuranga
Active Contributor

Join Date: Mar 2008
Posts: 15
#2
In reply to #1

Re: roughness factor for mild steel

04/25/2008 4:53 AM

Production equipment is a rim (tyre production ) and the material is mild steel. we using MAG Plant for welding.
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HarryBurt
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Hobbies - Fishing - New Member Popular Science - Evolution - New Member United States - Member - New Member Engineering Fields - Mechanical Engineering - New Member

Join Date: Jul 2007
Location: Cleveland, OH
Posts: 445
Good Answers: 10
#3

Re: roughness factor for mild steel

04/25/2008 9:16 AM

Welding galvanized steel is not a good idea, due to the zinc fumes released. Use a mechanical means, like folding and crimping, or adhesive instead.

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