Re: [MW:5904] Uphill Vs Downhill Welding

Dear Mr. Harikrishnan N S,

 

Welding uphill, or welding from the bottom to the top on vertical welds, provides much more penetration than welding downhill. Therefore, it is required in most instances to weld uphill by the industry.

In down hill welding the penetration and thickness of weld metal deposited in each layer is very less compared to uphill and completion time of joint is less than down hill. Generally down hill used in UG cross country pipe line as per API1104 other than all only used uphill welding including the compressor station, SV station also.

 

Mostly the client spec/code requirement in pressure vessel and process piping, AG piping used only up hill welding and also the filler or electrode manufacturer specification with respect to ASME sec II C

 

Note: Dear Bhavesh – I have special exp. With your comp. in single joint half portion up hill and another half down hill and make argument like "what will happen?" Don't generalize or deviate the good engineering practice in welding industry as per WPS is welding progression as Non essential (405.3)  but the application wise different.

 

Regards,

PSR.

 

On Thu, Jul 8, 2010 at 12:22 PM, Bhavesh Patel <bhaveshpatel.me@gmail.com> wrote:

Dear Harikrisnan,

 

It is not mandatory to do the welding in Uphill progression as per ASME Sec. IX.

 

See Clause No. QW-405.3 for better explanation.

 

If you change a progression in vertical welds then please check, is the welding consumable is recommended to weld in the same progression?

 

Check with respect to ASME Sec.II Part C.

 

 

Regards,

BHAVESH PATEL

Welding Engg.

ISGEC, DAHEJ

GUJARAT, INDIA

On Thu, Jul 8, 2010 at 10:51 AM, <HarikrishnanS@punjlloyd.com> wrote:

Dear Friends

What is the criteria for selecting Uphill/Downhill weld progression in a Pipeline/Piping? Is it mandatory to use uphill progression in a WPS qualified under ASME Sec IX ?

Thanks and Regards

Harikrishnan N S
Punj Lloyd Ltd, Mumbai


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