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Why is it difficult to weld cast iron?

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تم إضافة السؤال من قبل مستخدم محذوف‎
تاريخ النشر: 2013/12/17
Gigin Oommen
من قبل Gigin Oommen , Mechanical Project Engineer , SETE Energy Saudia Ltd.

Cast iron is difficult, but not impossible, to weld. In most cases, welding on cast iron involves repairs to castings, not joining casting to other members. A few facts about cast iron help in understanding the welding challenges. Cast iron typically has a carbon content of2% -4%, roughly10 times as much as most steels. The high carbon content causes the carbon to form flakes of graphite. This graphite gives gray cast iron its characteristic appearance when fractured. A critical temperature in most cast iron is about1450 degrees F. When at this temperature, conditions that can lead to cracking occur. While the arc will heat the casting to temperatures above this level, it is important that the casting not be held at this temperature for long periods of time.Proper selection of welding electrodes and pre heating the cast iron before welding will help reduce the possiblilty of cracking.

Shaheen K M
من قبل Shaheen K M , QHSE Engineer , Shine Star Eng. Steel & Welding LLC

Carbon Percentage in cast iron is High which make it brittle. So during the welding, coz of stress and heat it is prone to cracking.

Mohamed Abdel Raheem Abdel Kader
من قبل Mohamed Abdel Raheem Abdel Kader , QC Engineer , Petojet

cast iron has high content of carbon from2-4% and increasing carbon percentage decrease weldability

welding cast iron need high careful with suitabe series of heat treatment

مستخدم محذوف‎
من قبل مستخدم محذوف‎

mainly because during the welding process cast iron; being brittle, is prone to cracking. ways to prevents this are to preheat the whole piece to cherry red and when completed allow it to slow cool by wrapping in rock wool.

Abdelbagi  Mohammed Ahmed Abdin Abdin
من قبل Abdelbagi Mohammed Ahmed Abdin Abdin , mechanical engineer , Poyry Switzerland Ltd

due to the brittle nature of most cast iron

nithin thottathil
من قبل nithin thottathil , Mechanical Engineer , Bilfinger Deutsche Babcock Emirates LLC

due to high carbon content in CS its difficult to perform welding on CS materials since welding will eventually lead to formation of cracks because of stress generated.

Henry Jeminello
من قبل Henry Jeminello , Welder and Fitter , Rafols Industrial Machine Shop Inc.

It is difficult to weld cast iron if you dont know the procedure of doing it and if you dont know the proper electrode to be use.

Vigneshwar pandiyan
من قبل Vigneshwar pandiyan , Senior QAQC Engineer , Varifab Engineering Private limited

the repair are mainly came from forging ,so that is not difficult to weld, some air gap will occur so porosity will comes during welding

Mbam Livinus
من قبل Mbam Livinus , INSPECTOR , Lifting Gears

Cast iron is difficult to weld because it need an expert to handle the welding, the electrod takes time  .

Rijo Cheriyan Idicula
من قبل Rijo Cheriyan Idicula , Mechanical Engineer , Imperial Trading and Contracting Company W.L.L

yes its difficult, but possible 

Alavudeen Abdul Ali
من قبل Alavudeen Abdul Ali , Customer , Doosan Heavy Industries & Construction Co., Ltd

Any Material Have High Carbon Content Is There  Will Produce Crack After 48 or 72 Hours.

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