Welding Of Cast Iron Slideshare

It is strong in compression but weak in tension. This is an insane amount considering that any material with a carbon content above 030 is already considered high carbon and prone to cracking if proper procedures are not followed.

Cast Irons

During the welding of cast irons the iron immediately adjacent to the weld metal is heated to its fusion or melting point.

Welding of cast iron slideshare. Although you can fix cast iron pieces through welding techniques it can be challenging as you could end up causing further damage in the process. If placed in salt water it becomes soft. Brazing can be another process of joining the cast iron but it is not a welding process.

While cast iron could be welded by using the MIG process and specialized flux-cored electrode wires the resulting welded joint would not be as strong as the MMA. Such techniques include brazing the use of epoxy putty and the use of cold metal stitching. The welding procedure may be divided into five stages mechanical preparation of the piece for welding.

Cast iron is one of the more difficult metals to weld. Welding-up the break or crack. Repair of cracked or broken cast iron.

The most common welding processes are stick oxy acetylene and braze welding. As preheating will slow the cooling rate both in weld deposit and HAZ martensitic formation is suppressed and the HAZ hardness is somewhat reduced. The formation of hard and brittle HAZ structures make cast irons particularly prone to HAZ cracking during post-weld cooling.

CAST IRON PIPE 1Cast iron pipe CHARACTERISTICS Versatile Adaptable for use in all types of building Low-Cost Installation. Pure nickel rod 99 nickel. The cast iron is difficult to weld because of rapid heat up and quick cool down before and after welding.

Stick welding is the alternative method for welding cast iron where the electrode with flux is used. Welding cast iron is as much about the preparation as it about making the weld. It is very important to understand the challenges involved in cast iron welding.

Oxy-fuel gas process using filler which melts. HAZ cracking risk is reduced by preheating and slow post-weld cooling. It requires a lot of precision and high heat.

Welding techniques should be chosen based on their suitability to the cast iron alloy being welded. Cast Iron is generally defined as an alloy of Iron with 2 to 45 Carbon and usually with more than 01 Silicon The three main ingredients are Iron Carbon Silicone Cast iron containing more of these materials than steel. The tensile and compressive strength of cast iron of average quality is 150Nmm²and 600Nmm² resp.

Cast iron is naturally brittle and most repairs are usually for broken casings or cracks. This will help you in solving the. The machining is required after we complete this process.

Weldability of cast iron is low and depends on the material type thickness complexity of the casting and on whether machinability is important. The selection of proper filler metal is the foundation of the cast iron welding. This is regarded as the best welding rod to use on cast iron.

When welding cast-iron by the metallic arc process with cast-iron electrodes it is usually necessary to preheat the casting. This welding rod can make the iron soft and machinable and can minimize cracking. What Kind of Welding Rods Should You Use on Cast Iron.

Its a good option to minimize the extreme heating and cooling of the electric welding processes and its easier to maintain the temperatures of the components with it. Due to Carbons presence 2-4 the cast iron which is two times more than steel and it behaves as graphite characteristics and the properties of these type cast iron are prevalent as grey cast iron. Opinions on the use of cast iron welding from the use of special filler rods to their complete unsuitability due to open arc such as TIG without the possibility of carbon migration.

The reason welding cast iron is a big challenge is that it contains up to 4 carbon. Cast iron welding is done by using stick electrodes like Lincoln Ferrowed rods or it can be brazed by use of bronze filler rods. PROPERTIES OF CAST IRON.

The process of cast iron welding has a few potential pitfalls. Brazing isnt really welding as it doesnt fuse the metal as a weld does. There are several ideal methods that you could use to repair cast iron that does not require welding.

Now it is time to know about the rods that should be used on cast iron while welding. It does not rust easily. GAS WELDING Sound weld is obtained by selecting proper size of flame filler material and method of moving torch The temperature generated during the process is 33000c When the metal is fused oxygen from the atmosphere and the torch combines with molten metal and forms oxides results defective weld Fluxes are added to the welded metal to remove oxides Common fluxes.

There are certain things that need to happen before the actual weld is applied and then immediately after the weld to prevent warping or cracking of the cast iron part. And given the brittle nature of the material and that its used everywhere from kitchen to workshop broken cast iron parts are not unusual. General Welding of Iron Pipes Weldability of Ductile Iron Due to their high carbon content all cast irons have a common factor affecting their weldability.

Cast iron is not impossible to weld although many that attempt to do so end up with cracked welds. There are different types of cast iron and Gray is the most common type. After welding the entire heat-affected zone cools very rapidly.

Low melting point Good fluidity It is. Oxy-acetylene welding is another option frequently used to weld cast iron. Cast iron soil pipe can be preassembled Product readily available SIZE AVAILABILITY 112 to 12 diameter 5 AND 10 length USES transporting water storm drains and sewage chosen over options like PVC especially in high rise projects like draining from the roof.

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