Why Cast Iron if often happens in Welder cracked? Before we only split on Cast Iron, it’s good if we first understand what is called the Crack in the metal, which cause the crack in the metal, what influences Chemical composition of a metal not easily cracked, What is the diagram and CCT CCCT, etc.. So we are not wrong in taking in the conclusion of a crack on the Cast Iron Welding.

WHAT is iron (cast iron) ?

In general, iron (Cast Iron) is the iron that have a Carbon content 2.5% – 4%. Therefore, the iron womb karbonnya 2.5% – 4% will have a nature Mampu welder (WELDABILITY) low. Carbon in iron can be sementit (Fe3C) or usually called the Free Carbon (graphite). Also need to know the contents of phosphorus and Sulfur material is very high compared to Baja.

There are several types of cast iron (Cast Iron), namely:

1. Iron WHITE (WHITE cast iron).

Where is all this iron carbon form Sementit so has the nature of very hard and danger. Micro Structure consists of Karbida that cause color White.

2. Capable of hammering iron (cast iron MALLEABLE).

This type of cast iron is made from white cast iron with the heat treatment re-purpose all disjoint clump graphit (Fe3C) will unravel into matrix Ferrite, Martensite and Pearlite. Have a similar nature with steel.

3. Gray cast iron (cast iron GRAY).

Type of cast iron is often found (about 70% iron gray). That have shaped FLAKE GRAPHITE. The nature of this iron strength is not very high and very low (Nil Ductility).

Factors that influence the nature welder (WELDABILITY) MATERIAL ON THIS?

1. Tension during cooling.

In theory welding weld material (weld metal / Weld metal) will contraction during cooling. Because of the fragility of this contraction-iron cast iron has a capacity lower than the steel.

2. Form that is not uniform.

Generally, cast iron is made in a form that does not or can design artistic. With such a complex form of iron is a bit much do not have a uniform thickness that this will affect contraction voltage that occurs on the material and easily cracked and there is also need to remember this preference is that this is flexible who has power is very low.

3. Haz a hard.

Haz on the iron close to Weld Metal will have a HARD nature. Violence caused by this part of the Haz not melt.

4. Carbon fastening of Base Metal.

Due welding iron mixed with a Base Metal akan cause fastening on Carbon Weld METAL causing the increase in the womb and sulfur PHOSPOR In Weld is METAL.

5. Oil absorption in iron.

Because of this material charatcer average porous then the occurrence of infiltration in the oil that causes GRAPHITE rotater the weld metal. Usually what is often experienced by practitioners welding, repair at the time of maintenance.

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