Re: [MW:10598] Weaving

The amount of weaving directly affects the heat input since the wider the weave the slower the travel speed.  With a slower travel speed the greater the heat input which will affect the weld and HAZ grain structure. This typically leads to lower impact toughness values and increased hardness.  Typically the tensile strength is not affected by the extent of weave.  Also, the width of the weave affects how well the weld pool is protected by the shielding and how well the weld metal will fuse to the base metal.  A max weave of 3 times electrode diameter for SMAW and 5mm for GMAW is typically specified since it produces the best overall weld quality and mechanical properties for the productivity achieved.

Geoff Rogers
Welding Engineer
Houston, TX

On Tue, Apr 5, 2011 at 2:42 AM, Ahmed Husain <ahmraha@yahoo.com> wrote:

Dear All,

 

Almost all SMAW WPS prepared in accordance to ASME IX, I have seen, it specify maximum weaving 3 times the electrode dia. But I am unable to co-relate this WPS requirement to any ASME code or Client (ARAMCO) requirement . If weaving 3 times electrode dia is not stated in ASME codes, then why does it is mentioned in WPS?

 

Kindly share some information on this subject.

 

 

Ahmed Husain
Mob-0547170325

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From: ramu ramalingam <ramu.srivi@gmail.com>

To: materials-welding@googlegroups.com

Sent: Fri, April 1, 2011 9:49:05 AM
Subject: Re: [MW:10554] Weaving

Hai,

 

If they want to weave more than 3 times of electrode/filler wire dia, better to make new WPS and proof all the necessary requirement to meet with old WPS.

 

Because,when we weave more, in production weld that time heat input will be increased and  its fail in tenstile test. The heat inputput  should not be more than 3 KJ/min for each process.

Regards,

RR

 

On Wed, Mar 23, 2011 at 11:31 PM, Sampath Kumar <skthatham@gmail.com> wrote:

Dear Friends,

 

WPS says the weaving is allowed/permitted 3times the diameter of the electrode.Please tell me wheather we can allow if the weaving is more than the allowable limit.If it can be allowed.What is the reasons and on what basis it is allowed?If it can not/should not be allowed.Why and what is the reasons?

 

My opinion is that it should not be allowed.[1]Because it deviates from the WPS.[2]properties may vary because of the excess heat In put due to excess weaving.

 

The contractor is of opinion that they will change the WPS to suit excess weaving.It is not an essential variable,hence it can be allowed.To substantiate their claim they say they will change the WPS and they will perform Hardness Test to prove that the properties were not changed.

With Best Regards

Sampath

 

 

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