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Guidelines for the welded fabrication of nickel （镍的焊接制造指南）
NiDI
Nickel
Development
Institute
Guidelines for
the welded fabrication of
nickel alloys for
corrosion-resistant service
A Nickel Development Institute
Reference Book
Series NO 11 012, 1994
Guidelines for
the welded fabrication of
nickel alloys for
corrosion-resistant service
Contents
Introduction i
PART I – For the welder 1
Physical properties of nickel alloys 1
Corrosion resistance of nickel alloy welds1
Avoid crevices 2
Embedded iron 2
Effect of surface oxides from welding 2
Other welding-related defects ...2
Welding qualifications3
Welder training 3
Weld joint penetration 3
Weld joint design 4
Preparation for welding 4
Cutting and joint preparation 5
Oxides and other surface layers .5
Contaminating elements 5
Chlorinated solvents 6
Health hazards 7
Fixtures and positioners 7
Backing materials7
Tack welding 7
Welding processes 8
Shielded metal arc welding8
Electrode types 8
Electrode storage 9
Welding current 10
Electrode handling 10
Arc Starting and Stopping 10
Weld Puddle Control 10
Out-of-Position Welding10
Weld Spatter 10
Gas tungsten arc welding10
GTAW equipment 11
Power 11
Current controls 11
Cooling 11
Electrodes 11
Nozzles 11
System leaks 11
Shielding gases ...11
Filler metals11
Operator guidelines 12
Arc initiation 12
Arc stopping 12
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