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The materials to be joined are overlapped

Materials are moved between Two roller electrodes

Pulses of current are supplied between the roller electrodes frequently

Each pulde creates a Spot Weld

The pulses are timed so that the spot welds overlap and create a continuos seam           Heat Source

Electric current flowing against the electrical resistance of the material creates heat

Applications

Domestic Radiators, fuel tanks, drums,metal containers

Pros

Creates a sealed unit

Economical

Easily automated

Sutiable for high-volume production

Cons

Restriced to straight lines

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1.electro slag welding is an automated process used to join thicker plates
2. The gap between the plates to be welded can be quite large as it is filled with molten metal
3. water cooled copper shoes prevent this molten metal from escaping from the joint
4. the carriage, shoes and electrode all move together leaving the solidified weld behind

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1. You need a well ventillated space for gases
2. gases could ignite if there is an open flame
3. keep cylinders from physical damage
4. keep cylinders chained up together

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Spot Welding or Resistance Spot Welding is a type of electric resistance welding used to weld various sheet metal products, through a process in which contacting metal surfaces points are joined by the heat obtained from resistance to electric current

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Images
How to Weld - MIG Welding : 11 Steps (with Pictures) - Instructables

www.instructables.com

Images may be subject to copyright.

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Please click here if you are not redirected within a few seconds. Images How to Weld - MIG Welding : 11 Steps (with Pictures) - Instructables www.instructables.com Images may be subject to copyright.

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Safety
1. Make sure you are wearing the proper PPE (personal protective equipment)
2. Check that your tanks have no leaks and are proprerly secured
3. Check that your gas to oxygen ratios are correct

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Oxy-Acetylene Welding and Safety - 2010 Safetycare Welding Safety video

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The neutral flame has a one-to-one ratio of acetylene and oxygen. It obtains additional oxygen from the air and provides complete combustion. It is generally preferred for welding.

The neutral flame has a clear, well-defined, or luminous cone indicating that combustion is complete.

The carburizing flame has excess acetylene, the inner cone has a feathery edge extending beyond it.

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Types of welding defects
1. porosity and blowholes
2. Undercut
3. Weld crack
4. Incomplete Fusion
5. Slag inclusion
6. Distortion

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Transformer (240v - 80v)

Bridge Rectifier (AC - DC)

Capacitor

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Oxygen Cylinder Black or blue

Acetylene Cylinder Red or Maroon

Hoses

Welding Torch

Pressure Regulators

Filler Metal

Parent Metal

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1. torch body (or handle)

2. two separate gas tubes (through the handle connected to the hoses)

3. separate control valves.

4. mixer chamber.

5. flame tube.

6. welding tip.