Welding Metallurgy-Weldability of High Carbon Steels

[Zacharias Rohith Joseph]

High Carbon Steel is characterized by as having what type of weldability?

1.Very Good Weldability

2.Not Weldable

3.Good weldability with SMAW process

4.Good Weldablity

5.Poor

Can the IWE's in the group pls explain why the answer to this question is option 3? 

[Ramin Kondori]

Dear Zacharias,

Carbon (in steel) always causes weldability issues.

It depends on the C-content and other elements (material's manufacturing process and heat treatment shall be taken into consideration). But in general, it makes it more difficult to weld.

You can easily find tons of useful information on this subject by googling "weldability of High Carbon Steels". Below, you can see examples of google's first page of search results for this: 

High carbon steels contain 0.60-1.0% carbon and 0.30-0.90% manganese. They are are very hard and strong, but also have poor weldability and are difficult to weld without cracking. Once heat treated, these are extremely hard and brittle.

The high carbon steels are difficult to weld because of the hardening effect of heat at the welded joint. Because of the high carbon content and the heat treatment usually given to these steels, their basic properties are impaired by arc welding. 

 

High carbon steel is even more prone to weld cracking than the other two groups of carbon steel. Welding high carbon steel will most likely require very thorough preheating and post-heating processes to avoid this. It could also require special welding filler metals.  

 

Regards

Ramin  Kondori

Sr. QA/QC & Welding Engineer

-----------------------------------------------------------

PG-Dip. in Welding Engineering (IWE  AT  0070)

BSc. in Civil Engineering (IUT)

BGAS Painting Inspector

ASNT Level I&II

                        

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[Kannayeram Gnanapandithan]

Because of variety of consumable is available for SMAW process, But welding is not easy like others, weldability is very poor. 

THANKS & BEST REGARDS,

KG.PANDITHAN, BE, IWE,  CSWIP 3.1,

ISO 9712 Level 2 in VT,

ASNT-Level II in PT,MT,RT & UT,

LA ISO 9001-2015,

International Welding Engineer. 

CONSULTANT-WELDING & QUALITY

Mobile no: +919940739349

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[George Dilintas]

You  could weld them using the same method for welding cast iron.

I have done it and it works

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Dr. Georgios Dilintas,

Dipl. Ing. In Aeronautic and Space Engineering

Ph.D in Mechanics of Solids - Computational Mechanics

A.I.S, A.N.I, IRCA Lead Auditor

Welding, Stress Analysis, Corrosion, QA/QC, Failure Analysis, Risk Analysis