Re: [MW:32202] SM490A weld to railway

Railway material is  with High Carbon  so will have  high strength  with  High HAZ hardness .

The electrode deployed - E7016 has less strength .

Use E11018   with pre heating   and 3.15  dia with stringer bead technique.

After full welding , maintain pre ehat maintenance  say 350  Deg C - 2 HRS  and then cool under insulation 

This shall 

On Sat, Apr 10, 2021 at 8:16 AM Pravin Poornachandran <htcispravin@gmail.com> 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: materials-welding@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 <htcispravin@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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