Re: [MW:32203] SM490A weld to railway

E-7016 not be suitable for SM490A to Rail steel (low alloy steel)

Below suggestion given based on both material Chemical & Mechanical properties.

Sugeested welding consumable for SM490A to Rail steel (low alloy steel) is E-12016-G electrode

Preheat temp. for the rail steel- 200 to 300 Deg.C

Interpass Temp.:- Less than 400 Deg.C

Slow cooling required after welding by insulation covering.

Regards,

Pravin Nimbalkar

Welding Engineer

On Saturday, April 10, 2021 at 9:46:15 AM UTC+5:30 Pravin wrote:

Dear Sir,

 

Enclosed material properties of railway material, while SM490A is ordinary mild steel with low carbon content <0.3%

Along I have enclosed picture of the crack.

 

1^st picture was without preheat, while 2^nd picture was with preheat 230degC & postheating 250degC x1hr.

However, crack still occurs. I'm bit lost at this point.

 

Sent from Mail for Windows 10

 

From: Vishwas Keskar
Sent: Thursday, 8 April, 2021 8:04 PM
To: material...@googlegroups.com
Subject: Re: [MW:32191] SM490A weld to railway

 

Pl. send MTCs of both the materials 

 

On Thu, Apr 8, 2021 at 2:51 PM Pravin Poornachandran <htcis...@gmail.com> wrote:

Dear Expert,

 

We are doing a weld joint with following base metal combination: 

SM490 weld to railway (alloyed, high tensile material) 

 

I used E7016 for this welding, after 4 hours, crack was observed on the weld toe,

however there is no crack on the weldment, thus I assume this is cold crack. 

 

Crack was noticed on the railway material, not on SM490A material. 

 

Welding condition:

Baking was done 300-350degC x 1hr 

thickness: 16mm both material 

Preheat: 200degC 

Post heating: 250degC x 1hr

 

Can anyone advise how to solve this crack defects

 

Best regards,

Pravin Poornachandran

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