Unit 10 Welding, Brazing and Cutting. Safety Principles General safety rules apply in ANY shop! Always observe all rules and procedures given by instructor.

Unit 10Unit 10

Welding, Brazing and CuttingWelding, Brazing and Cutting

Safety Principles

• General safety rules apply in ANY shop!

• Always observe all rules and procedures given by instructor

• Proper PPE should be worn at ALL TIMES– Jeans with no frays– Cotton long sleeved shirt– Close toed shoes/boots– Safety glasses and helmets

• Know where fire extinguishers are located in case of emergency

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Fire Extinguisher Classifications

Basic Welding Processes

• SMAW– Stick welding, use electrode to

melt metals– Typically the first process learned– Used for repair and maintenance– Popular in agricultural industry

• GMAW– Gas metal arc welding, use wire

fed through MIG gun– Relies on inert gas– More expensive– Superior results

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Basic Welding Processes

• GTAW– Gas tungsten arc welding

(another form of GMAW)– Slower– High quality welds

• OFW– Oxyfuel welding (fusion and

braze)– Electrode rod with base metal

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Electrode Rods and Wires

• Electrode Rods– Welding rod coated with flux– Different rods are available– Differ in tensile strength and flux

coating

• Electrode Wires– Packed in spools– Classified differently– Differ in tensile strength

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Electrode Rod

Electrode Wire

Welding Positions

Welding Positions

Welding Joints

Welding Joints

Oxyacetylene and Plasma Arc Cutting

• Oxyacetylene cutting-– Used on ferrous metal (steel)– Portable, useful in agricultural

industry

• Plasma cutting-– Stationary or handheld– Can be run by computer

• Plasma Arc SAFETY– Higher voltage– Never use in damp, wet areas– Use ear plugs/muffs– Proper PPE

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