Saturday, August 14, 2010

[MW:6493] but welding of unequal thickness member as per UW-9 OF ASME SEC VIII DIV 1

Dear All,
 
Good Day.
 
 
 
Please  inform me what will be the Minimum length of the taper for butt weld between plates of 10 mm and 20mm Thickness.
 
Please refer Fig. 2 of the attachment and inform me--
 
whether length of taper will be distance between edge of plate ( The point from where tapering is statring ) to root face of the bevel i.e L
                                   OR 
Length of taper will be  from  edge of plate ( The point from where tapering is statring ) to the point where  thickness of the thicker member becomes equal to thickness of the thinner member i.e L1
 
What is the maximum angle allowed for tapering.( please refer Fig. 1(a)  of the attachment)
 
Thanks in advance.
 
Regards
 
Asad
 

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1 comment:

Unknown said...

dear asad,
for welding unequal thickness, the taper must be in the ratio 4:1.
refer ASME B31.4 or ASME B31.8 for details.

generally the weld height must must be 0.5 x lower thickness.

tino

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