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Shield Metal Arc Welding 1 > Harfacing > Flashcards

Flashcards in Harfacing Deck (4)
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1

Types of wear

Abrasion
Impact
Erosion
Corrosion
Thermal
Compression
Oxidation

2

Types of hard facing electrodes

High speed steels
Austenitic manganese steels
Chromium carbides
Tungsten carbides
Copper alloys
Nickel chromium alloys

Refer to the chart on page 220 for their AWS identifications

3

Types of hard facing patterns and what they're good for

Grid or "waffle" pattern
Abrasion wear

Parallel line or "stringer beads" pattern
Run in the direction of material flow. This pattern is particularly suited for the teeth or dipper shovels that work with rocks. The rocks ride the hard facing beads protecting the base metal

Button pattern
Is good for impact wear

4

Problems in hardfacing

Cost
Dilution
Spalling
Stress failure
Cracking
Distortion

Pages 224-225