First thanks for all reply.
I am not trying to contradict the adverse affect of increase heat input. I am just trying to find any reference document for weaving. At my current project, I have seen many violation reports related to excessive weaving. In most of the cases, material being welded didn't required toughness/impact test. In all violation reports, only WPS reference was mentioned. My point is that on what basis, it is decided that maximum weaving shall be 3 times of diameter, not 4 times or 5 times. Sould not be different weaving requirement for different material? As far experienced is concerned, it differs from persons to persons.
Does any member of this group have tried or have experienced of welding with 4 or 5 or 6 times electrode diameter weaving then the material or test failing the requirements. Kindly share your knowledge.
Mob-0547170325
From: John Henning <jhenning@deltak.com>
To: materials-welding@googlegroups.com
Sent: Tue, April 5, 2011 8:58:39 PM
Subject: RE: [MW:10606] Weaving
In the preceding replies, you've been advised that weaving increases heat input which adversely affects impact properties (i.e. dbtt moving to higher temperature, lower upper shelf values). In addition, with stainless steel, higher heat input will cause greater grain coarsening and increase the potential for sensitization. Increasing weave width also increases the propensity for slag or silica entrapment. The choice of maximum weave width is often proscribed by the customer as insurance against these problems.
As to your last statement as to why ASME does not address this – you need only read the Foreword included with each Code book. To whit, In part: ". . .This Code contains mandaroty requirements, specific prohibitions, and non-mandatory guidance for construction activities. The Code does not address all aspects of these activities . . . The Code is not a handbook and cannot replace education, experience, and the use of engineering judgment. . . . Engineering judgments must be consistent with Code philosophy and such judgments must never be used to overrule mandatory requirements or specific prohibitions of the Code. . . . "
John
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Ahmed Husain
Sent: Tuesday, April 05, 2011 2:42 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:10597] Weaving
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
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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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.
To post to this group, send email to materials-welding@googlegroups.com
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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.
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