Suggested Welding Electrodes for CR 120 rail (IS 3443 -1980)

[Gopalakrishnan G]

Hi would you please help me in selecting of welding electrodes for CR 120 Rails.Also recommend the joint design and welding procedure ( interpass temperrature and preheat temperature.

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G.Gopalakrishnan
Welding Engineer
Mukand Ltd
Mumbai
Moble :+91-9833397917

[c sridhar]

There are many procedures to join the rails.

One such easy procedure is use of E 312 ( 30% Cr & 10 % Ni) through SMAW process.
This could be done better by FCAW process with equivalent filler wire.

A preheating of 300 /350  deg. C and a inter pass temp. of 250 Deg. C shall help to avoid HAZ cracks.
Any cracks seen in the initial 3 to 4 runs should be ground off to sound weld metal.

Since the rail joint is deep, the bevel opening could be kept low (say 15 to 20 deg) and opening to suit
the torch maneuverability and s copper strip of 8 mm thick or so could be used as a back up for initial runs.

A buffer layer of 2 to 3 runs  on either side of fraying surfaces before joining with same type of consumable
will help to get a good fusion line between the base mental and weld.

The post weld heating to same temp coupled by slow cooling (by proper covering beyond HAZ)  will help
to avoid cracks in HAZ.

Advantage with this procedure is, you can avoid PWHT.

Trust it will help you to weld a new or a cracked joint.

 

regards,
Sridhar.

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From: Gopalakrishnan G <gopa...@gmail.com>
To: "material...@googlegroups.com" <material...@googlegroups.com>
Sent: Saturday, 4 January 2014 5:52 PM
Subject: [MW:19759] Suggested Welding Electrodes for CR 120 rail (IS 3443 -1980)

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[GENE MATSKO]

Check AWS D15.2:2003 Railroad Welding.....

Gene Matsko

[Roshan Xalxo]

you have to use sp-6 electrode for rail welding ,preheatina temp.250 to 300 c. interpass temp. 350-400c. this technique is best way for rail welding.