Skip to main content

RE: [MW:11211] ARC Blow

By Materials & Welding

In general The shifting of the arc in various directions in electric-arc welding due to the magnetic fields at the arc.

OR

A welding arc may be deflected away from the point of welding, which can mean that the weld quality may suffer. Such arc deflection, usually forward or backward of the welding direction, is known as 'arc blow'.

 

Arc blow tends to occur if the material being welded has residual magnetism at a certain level, particularly when the weld root is being made. This is due to interaction between the directional magnetic field of the welding arc and the directional field of the residual magnetism.

 

Remedies for Arc Blow - Arc blow can be minimized by keeping the following factors in view:

1. Electrode geometry in non consumable electrode welding (e.g., TIG and carbon arc welding).

2. Changing the position of earth clamp or current return lead and welding away from the earth connection.

3. Avoiding the presence of (or rearranging) magnetic materials around the workpiece and arc.

4. Storing workpieces away from magnetic sources, such as welding power sources.

5. Lowering the arc current.

 

ETC

 

Thanks

 

 

 

Regards,

Prakash Verma

Aker Drilling Risers

Aker Solutions

MOBILE - 0047-40466591

DESK- 0047-22945932

Email: Prakash.Verma@akersolutions.com

 

-----Original Message-----
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of we1414
Sent: 30. mai 2011 11:26
To: Materials & Welding
Subject: [MW:11206] ARC Blow

 

Dear experts Hello to all of you as i m new to this group.

my query is about arc blow. pleas explain why it occurs during welding

and how can it be controlled.

 

--

To post to this group, send email to materials-welding@googlegroups.com

To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com

For more options, visit this group's bolg at http://materials-welding.blogspot.com/

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.

 


This e-mail and any attachment are confidential and may be privileged or otherwise protected from disclosure. It is solely intended for the person(s) named above. If you are not the intended recipient, any reading, use, disclosure, copying or distribution of all or parts of this e-mail or associated attachments is strictly prohibited. If you are not an intended recipient, please notify the sender immediately by replying to this message or by telephone and delete this e-mail and any attachments permanently from your system.

Comments

Post a Comment

Popular posts from this blog

Materails FAQs

By Materials & Welding
Q: What are equivalents for standard Q 235 B (and Q 235 A) for U-channels? (asked by: boris.vielhaber@vait.com) A: DIN Nr. = 2393 T.2, 2394 T.2, EN 10025 W. Nr. DIN 17007 = 1.0038 Design DIN 17006 = RSt 37-2, S235JRG2 (Fe 360 B) Q: What is St DIN 2391 BK material? (asked by: dmcandrews@automaticstamp.com) A: Precision steel tubes, cold-finished/hard. Q: What is C.D.W. Boiler Tube? (asked by: montydude123@yahoo.com) A: Cold Drawn Welded Boiler Tube. Q: WHAT IS W.Nr. 1.4301? PLS TELL US IN EASY LANGUAGUE (asked...
21 comments
Read more

Heat tint (temper) colours on stainless steel surfaces heated in air // Heat tint

By Materials & Welding
Introduction The colour formed when stainless steel is heated, either in a furnace application or in the heat affected zone of welds, is dependent on several factors that are related to the oxidation resistance of the steel. The heat tint or temper colour formed is caused by the progressive thickening of the surface oxide layer and so, as temperature is increased, the colours change.   Oxidation resistance of stainless steels However, there are several factors that affect the degree of colour change and so there is no a single table of colour and temperature that represents all cases. The colours formed can only be used as an indication of the temperature to which the steel has been heated. Factors affecting the heat tint colours formed Steel composition The chromium content is the most important single factor affecting oxidation resistance. The higher the chromium, the more heat resistant the steel and so the development of the heat tint colou...
Post a Comment
Read more

Re: [MW:10788] ON PLOT PIPING & OFF PLOT PIPING

By Materials & Welding
Piping systems involved for the flow lines and gathering lines from the well head isolation valve to the production facility or processing plant isolation valve are determined as OFF PLOT. ON PLOT defines piping system in the processing plant and production platform. ANSI/ASME B31.4 applies for off plot piping system. B31.4 allows the use of either API 1104 or ASME section IX (as appropriate). However, occasionally, a very small system such as piping within 500 feet of a processing plant (some client also said 400 feet) may be declared B31.3 rather than B31.4. When B31.3 is invoked, only ASME Section IX is used. before you decide which code to use for welding procedure and/or welder qualification for pipe welding, you have to know the design and construction code applicable to the system. Please read far enough into scope and diagram illustrating the application of either B31.3 and B31.4 hope this helps rgds 2011/4/21 pradip kumar sil < pradipsil@gmail.com > Dear all, ...
Post a Comment
Read more