Rectangular Duct Design per SMACNA

[strainstress]

Hi All,

I have question about rectangular sheet metal duct welding.

When joining the sheet metal to form a rectangular duct, is it required to use a continuous longitudinal seam weld at the welded corners (See Figure 16, SMACNA 1980), or is intermittent seam weld acceptable. Use of continuous seam weld seems like on overkill. What is the common standard practice in duct world ?

Thanks
StrainStress

 

[jayrod12]

refer to mechanical.. haha..

 

[jayrod12]

but in all honesty, I have no clue, I though all the sheet metal joints were just folded over itself unless zero leakage was required.

 

[AUCE98]

Continuous weld is required to eliminate the pressure loss within the duct.