How to remove magnet from welding joint.

[Gince Varughese]

Hi Experts,

I am facing so many time the welding have magnet.A magnetic field present in the weld preparation region of pipe components can cause the type of weld problem that could never pass inspection.I want remove magnet from the joint.Can i get solution?

Thanks,

Gince Varughese

+971561297163

[kannayeram gnanapandithan]

Demagnetizing equipments are available in market or use MT equipment to remove or SR 

THANKS & BEST REGARDS

KG.PANDITHAN, AWS-CWI, CSWIP 3.1

CONSULTANT-WELDING & QUALITY

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[Pratik Kshirsagar]

Dear GV,

Generally welding can be done defect free at a magnetic field of 20G. Secondly if using GTAW, 10G creates problem in arc stability. So check with the magnetic strength and the process.

Magnetism can be minimised by any of the method;
1. Using demagnetizer available in market.
2. By creating magnetic field in opposite direction that of current magnet by passing current through coil.

Hope I have answered your query.

Regards,
Pratik Kshirsagar
L&T HED SURAT.
+919099031399

[Gince Varughese]

Dear Sir,

Thnk you for your valuable reply.
But I am not understand your magnet remove solution.Can you clear to me please.

Thanks ,
Gince V.



Sent from: Lenovo S960

[Ali Al-Zawamri]

Wrap weld cable around the pipe and start welding.
By this magney field will be reduced.

[José Luís Ferreira]

If you notice an increase in magnetism, change the direction of the coil or reverse polarity. The direction of the magnetic field will be in accordance with the rule of right hand.

--

José Luís N. S. Ferreira
Jlui...@gmail.com

(79) 9984-6901 (vivo)
(79) 9199-6907 (TIM)

[Eyup Tan]

I hope attached sketch will help you to understand how to coil apply for demagnetizing. 

Regards,

Eyup Tan

 

[Shashank Vagal]

Hi Eyup,

You need to demagnetise the joint, first measure the magnetic field intensity and plan accordingly. You can use AC from your welding machine if a proper set up to demagnetise is not readily available.

 

With Best Regards,

Shashank C Vagal (Quality Adviser)

Neo Metal-Analyst & NDT Services (Approved by IBR, Thermax, etc)

Regd Office: 301, PRATHAMESH, M G Rd – Mahant Rd, Vile Parle East, Mumbai 400 057 INDIA

Tel : +91 22 2611 6640 / +91 9821386292 /  8082395502 / 9819191861    

Works Office: B2, Matere House, Sector No. 14, Pradhikaran, Gat No. 62, Boradewasti, Moshi, Dist: Haveli, PCMC, Pune – 412105, Maharashtra, India
      
www.neometalanalystndt.com / enq...@neometalanalystndt.com / nach...@yahoo.com

[Gince Varughese]

Hi.,

Thanx for info.

wrap the ground cable and two ground cables one on each side of the joint, weld towards the arc blow and worse case 

temporary weld a bar across the pipe.Attached a photo.

Best Regards,

GV

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Date: Thu, 19 Jun 2014 09:53:08 +0800
From: material...@googlegroups.com
Subject: Re: [MW:21184] How to remove magnet from welding joint.
To: material...@googlegroups.com