B-15

OPERATION

B-15

4.The bead should be put on with a weaving motion, and it should be 1/2-3/4” (12.7-19.0mm) wide. Do not let the arc blow over the edge, as that will dull the edge. (See drawing below.)

Work Table

Strike Arc

 

Here

Sharp Edge

Brick

 

 

 

Plow Share

 

1/2-3/4" width

 

(12-20mm)

 

 

Positioning of Share

Weaving Motion

5.Use the back-stepping method. Begin to weld 3” (76mm) from the heel of the share and weld to the heel. The second weld will begin 6” (152mm) from the heel, the third weld 9” (229mm) from the heel, etc.

B

A

C

D

E First weld from A to B; then

 

 

3"

 

 

 

 

 

 

from C to A; then from D to C;

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

then from E to D; and so on.

(75mm)

 

 

 

 

 

 

 

 

 

BACKSTEPPING

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Backstepping greatly reduces the chances for crack- ing of the share, and it also greatly reduces warping.

NOTE: The entire process is rather fast. Many begin- ners go much too slowly when hardfacing plowshares, running the risk of burning through the thin metal.

Welding Cast Iron

When welding on a piece of cold cast iron, the tremendous heat from the arc will be absorbed and distributed rapidly into the cold mass. This heating and sudden cooling creates WHITE, BRITTLE cast iron in the fusion zone. (See drawing below.)

When breaking the weld stays on one piece

To overcome this, the welding operator has two choices:

1.Preheat the entire casting to 500-1200°F (260- 649°C) If the cast iron is hot before welding, there will be no sudden chilling which creates brittle white cast iron. The entire casting will cool slowly.

2.Weld 1/2” (12.7mm) at a time, and do not weld at that spot again until the weld is cool.

This way, no large amount of heat is put into the mass.

Most inexperienced welders will probably use the sec- ond method, because they have no way of preheating large castings. Smaller castings can easily (and should) be preheated before welding. A forge, stove, fire, or the Arc Torch are all excellent means of pre- heating.

When using the 1/2” (12.7mm) at a time method, it is recommended to start 1/2” (12.7mm) away from the previous bead and weld into the previous bead. This is called backstepping.

After welding Cast Iron, protect the casting against fast cooling. Put it in a container of warm, dry sand or lime.

If sand or lime is not available, cover it with sheet metal or any other non-flammable material that will diminish drafts and retain heat.

hot

coldcold

White brittle cast iron

Cast Iron Plate Preparation

This is the reason why welds in cast iron break. Actually, one piece of the broken cast iron has the entire weld on it and the other piece has no weld on it. (See drawing below.)

Wherever practical, the joint to be welded should be “veed” out by grinding or filing to give complete pene- tration as shown in figures (a), (b) and (c) below. This is especially important on thick castings where maxi- mum strength is required.

POWER-ARC 5500

Page 29 Page 31
Page 30
Image 30
Lincoln Electric IM871-A manual Welding Cast Iron, Cast Iron Plate Preparation
Page 29 Page 31

IM871-A specifications

The Lincoln Electric IM871-A is a cutting-edge industrial welding machine that exemplifies the brand's commitment to quality, innovation, and efficiency. Designed specifically for professionals in various sectors, including manufacturing, construction, and maintenance, the IM871-A boasts a range of features that streamline the welding process while ensuring longevity and reliability.

One of the standout features of the IM871-A is its advanced inverter technology. This technology not only enhances the machine’s portability but also improves energy efficiency. The inverter design allows for a compact and lightweight unit without sacrificing power output, making it easier for welders to move around job sites while maintaining peak performance. Welders can expect to achieve high-quality welds with minimal spatter, ensuring a clean and professional finish.

The IM871-A is equipped with a multifunctional interface, allowing users to easily navigate through various settings and customize their welding parameters according to specific project requirements. This user-friendly display includes digital readouts for voltage and current, providing real-time information that aids in precision control. Such adaptability makes the IM871-A suitable for a wide range of welding applications, from thin sheet metal to heavier structural components.

Additionally, the Lincoln Electric IM871-A supports multiple welding processes, including MIG, TIG, and Stick welding. This versatility makes it an ideal choice for professionals who require a machine that can handle diverse tasks without the need for multiple setups or equipment. The welder's robust output range further enhances its capabilities, accommodating various materials and thicknesses for both ferrous and non-ferrous metals.

Safety is paramount in any welding operation, and the IM871-A incorporates several features designed to protect the user. These include built-in thermal overload protection, which prevents the machine from overheating during extended use, and an automatic voltage reduction system that ensures the welder remains safe while efficiently managing power.

In summary, the Lincoln Electric IM871-A is a powerful and versatile welding machine built to meet the rigorous demands of industrial applications. With its advanced inverter technology, intuitive user interface, multiple welding process support, and essential safety features, it stands out as a reliable choice for professionals aiming for quality and efficiency in their welding operations. Whether for onsite applications or workshop environments, the IM871-A is engineered to deliver exceptional performance and durability, solidifying its place in the competitive welding market.
Top Page Image Contents