2- some terminologies in welding_student
DESCRIPTION
weldingTRANSCRIPT
SOME TERMINOLOGIES
IN WELDING
TYPES OF WELDING JOINT
Joint Terminology
JOINT DESIGN
• Consists of:
Types of Joint Preparations
Types of Joint Preparations
Single Joint Preparations
Double Joint Preparations
TYPES OF WELD
A_________Welded butt joint
A_________Welded butt joint
A____________Welded butt joint
Welded Butt Joints
Single V Groove Weld
Double Fillet Weld
Combination of Single Bevel Groove & Double Fillet Weld
A_________Welded T joint
A_________Welded T joint
A____________Welded T joint
Welded Tee Joints
Single Fillet Weld
Single Bevel Groove Weld
Combination of Single Bevel Groove & Double Fillet Weld
A_________Welded lap joint
A_________Welded lap joint
A____________Welded lap joint
Welded Lap Joints
Double Fillet Weld
Spot Weld
Combination of Spot and Double Fillet Weld
A_________Welded closed corner joint
A_________Welded closed corner joint
A____________Welded closed corner joint
Welded Closed Corner Joints
Single Fillet Weld
Single Bevel Groove Weld
Combination of Single Bevel Groove & Fillet Weld
A_______________Welded open corner joint
A_______________Welded open corner joint
A_______________Welded open corner joint
Welded Open Corner Welds
Single Fillet Weld
Single Fillet Weld
Double Fillet Weld
WELDING POSITIONS
• 1 –
• 2 –
• 3 –
• 4 –
Welding Positions
45o
Welding Positions
POSITIONS FOR FILLET
WELDING
• 1F
• 2F
• 3F
• 4F
POSITIONS FOR GROOVE
WELDING (PLATE)
• 1G
• 2G
• 3G
• 4G
POSITIONS FOR GROOVE
WELDING (PIPE)
• 1G
• 2G
• 5G
• 6G
• 6GR
WELDABILITY OF MATERIALS
• WELDABILITY IN GENERAL – the ability of material to be welded.
• GOOD/HIGH WELDABILITY – the ease of material to be welded using cheaper mean of welding process and simple technique
• FABRICATION WELDABILITY – the ability of the material to have good relationship with the welding process to produce sound weld and good weld geometry, free from porosity and cracks.
• SERVICE WELDABILITY – the ability to produce weld that can sustain thermal and mechanical stresses, corrosion, and other service requirement
EXAMPLE OF WELDABILITY OF
MATERIALS
• HIGH/GOOD WELDABILITY – e.g. mild
steel / low carbon steel.
• LOW/BAD/POOR WELDABILITY – e.g.
medium carbon steel, high carbon steel,
high alloy steel, Stainless Steel, Aluminium
CARBON EQUIVALENT
• CARBON EQUIVALENT (CE) – numerical value of Weldability Assessment in terms of carbon equivalent content for the measurement of the weldability of carbon steels & alloyed steels.
• CE = %C + %Mn/4 + %Ni/20 + %Cr/10 +
%Mo/5 + %Cu/40 + %V/10 (AWS)
CE < 0.5 – steels are weldable
CE > 0.5 – crack sensitive
CE < 0.4 – relatively less sensitive to cracks
High CE – require preheating, use low hydrogen welding procedure