Re: [MW:13568] Decrease in bevel angle - Essentail variable as per Shell DEP

this always associated with width & depth ratio. the ratio supposed to
be in acceptable range - should not be below 0.8.

Suppose the ratio exceed 0.8, it lead to solidification crack. Depth &
width ratio is one the factors contribute solidification crack.

Rgds

2012/1/25, N VENKATESWARA PRASAD <weldengr.velosi@gmail.com>:
> Dear All,
>
> As per Shell DEP 30.10.60.18, the decrease in angle is essentail
> variable. What is concept behind it? Is is applicable for Compound/
> composite angle joint design also. As per this joint design up to 19
> mm the bevel will be 37.5 degrees, later it will be only 10 degres.
>
>
> My concept is the anlge is only for accessability and in case of DSS,
> Nickel alloys higher anlge for better wetting. It should not
> applicable for carbon steels.
> Please debate on this.
>
> The Clause as per DEP as given below:
>
>
> 11.1 Add new clause 11.1.4 It is the Manufacturer's responsibility to
> ensure that
> welding operations are carried out in accordance with the
> parameters as specified on the qualified WPS. Unless
> otherwise specified by local regulations, welding procedures
> shall be qualified in accordance with ISO 15607 and/or
> ASME IX. Irrespective of the design code, welding procedure
> qualifications shall be re-qualified when any of the following
> conditions occur:
> • Joints
> - A change from double sided to single sided welding, or
> vise versa (delete) but not the converse;
> - A decrease in welding groove angle of more than 10
> degrees.
> • Consumables
> - Any change of consumable classification;
> - Any change in consumable brand name when corrosion
> testing or impact testing is required;
> - Any change in size of more then 1 mm of consumable in
> the root run of single sided welds.
> • Welding position
> Change in welding direction (vertical up to vertical down
> welding or vice versa).
>
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The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.