Manual Metal Arc M.M.A (Leaving Cert Engineering): Flashcards

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Manual Metal Arc M.M.A
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Electric arc welding process

Electricity jumps across gap creating heat to join metals

Temperature of electric arc

Over 3,000°C

MMA welding stands for

Manual Metal Arc

Voltage in MMA: 240V240V reduced to

80−100V80-100V

Flux in MMA welding

Chemical powder coating on electrode

Function of flux coating

Creates protective gas shield; forms slag coating over weld

Slag in welding

Protective coating over weld from solidified flux

Purpose of chipping hammer

Remove slag after welding

Purpose of wire brush in MMA

Cleaning the weld area

Essential safety condition for MMA

Dry conditions - free from dampness

Main material for MMA welding

Mild steel plates

Explore Leaving Cert Engineering Revision Notes by Topics

Introduction to Welding

Gas Welding

Electric Arc Welding

Resistance Welding

Explore Leaving Cert Engineering Model Answers by Topics

Introduction to Welding

Gas Welding

Electric Arc Welding

Resistance Welding

Explore Leaving Cert Engineering Quizzes by Topics

Introduction to Welding

Gas Welding

Electric Arc Welding

Resistance Welding

Explore Leaving Cert Engineering Exam Questions by Topics

Introduction to Welding

Gas Welding

Electric Arc Welding

Resistance Welding

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