cold welding
DESCRIPTION
bvcghTRANSCRIPT
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COLD WELDING
PRESSURE GAS WELDING
ROLL BONDING
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Solid
State
Welding
Electrical
Chemical
Mechanical
Pressure
Pressure &
DeformationCold Weld
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Definition of Cold Welding
• Cold welding adalah proses solid
state dimana tekanan digunakan
pada temperatur kamar untuk
menggabungkan logam melalui
deformasi pada lasan
• Sambungan butt dan lap dapat di
cold welded
Die
Flash
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A: Lap both sides indented E: Draw Weld
B: Lap One side indented F: Wire Lap (before and after)
C: Edge both side indented G: Mash Cap Joint
D: Butt in Tube H: Butt (before and after) AWS Welding Handbook
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Characteristics of Cold Welding
• Salah satu logam yang akan dilas harus ductile tanpa mengalami work-hardening yang berlebihan.
• Tidak ada pemberian panas.
•Dapat menyambng dissimilar metals
•Preparasi permukaan sangat penting
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Cold Welding Process Description
• Komponen yang akan dilas harus dibersihkan dulu.
• A short section of the part is sheared.
• The parts are clamped in a die with some initial extension.
• A forging force is applied to complete welding.
Dies
Workpiece Workpiece
Before welding
After welding
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Applications of Cold Welding
• Cold welded butt joints are used in the manufacturing of aluminum, copper, gold, silver, and platinum wire.
• Most commonly, successive reels of wire are joined for continuous drawing to a smaller diameter.
• Aluminum alloys used in cold welding include: 1100, 2319, 3003, all 5000 series, 6061 and 6201.
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Equipment
Cold Welding Equipment
•A manually operated cold welding machine (courtesy AWS handbook).
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States of Upset During Butt
Cold Welding Single Upset Cold Weld in
Type 1100 Aluminum Wire
Courtesy AWS handbook
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Stages in Multiple Upset Cold Welding AWS Welding Handbook
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AWS Welding Handbook
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Multiple Upset Cold Weld
AWS Welding Handbook
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Transverse Flow Lines in a
Cold Welded Butt Joint
Courtesy AWS handbook
Can Effect Joint Efficiency
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AWS Welding Handbook
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Other Cold Welding
Applications
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Cold Welded Electrical Component
Cold Welding in the Manufacture
of Industrial Packaging
Application
Courtesy AWS handbook
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Saijo, K et al, “method and Apparatus for Cold Rolling Clad
Sheet”, US Patent 4,896,813 Jan 30, 1990
Cold – Vacuum Cladding (glow discharge surface prep)
Etching
Chamber
High Frequency
Glow Discharge
Surface Etch
Clean
Surface
To Rolling
Mill
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PRESSURE GAS WELDING Heat Can Help
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Solid
State
Welding
Electrical
Chemical
Mechanical
Flame
Contact
Pressure &
Deformation
Pressure
Gas Weld
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Pressure Gas Welding
• Proses las dengan oxy-fuel gas menghasilkan penggabungan secara simultan pada seluruh area permukaan melalui pemanasan menggunakan gas flames. Gas flame diperoleh dari pembakaran bhn bakar gas dengan oksigen dan pemberian tekanan dan deformasi tanpa menggunakan filler metal
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Pressure Gas Welding Processes
•Open joint pressure welding.
•Closed joint pressure welding.
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Pressure Gas Welding Principles of Operation: Open Joint Method • The faces to be joined are heated
individually to the welding temperature.
• After heating, the two faces are brought into contact.
• Upsetting force is applied to complete welding.
Workpiece Workpiece
Workpieces are heated separately
Upsetting pressure is applied
Final weld
Upsetting
force
Principle of Operation
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Pressure Gas Welding Principles of Operation: Closed Joint Method
• Faces to be welded are butted together under initial pressure.
• Metal at the joint is heated to welding temperature with a gas flame.
• Finally, the metal is upset sufficiently to produce a weld.
Upsetting
force
Upsetting
force
Heating torch Flame
Workpiece Workpiece
Before welding
After welding
Principles of Operation
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AWS Welding Handbook
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AWS Welding Handbook
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AWS Welding Handbook
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AWS Welding Handbook
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AWS Welding Handbook
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Pressure Gas Weld
Little Visible Centerline
Good Mechanical Properties
AWS Welding Handbook
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Applications of Pressure Gas Welding
•Pressure gas welding has been successfully applied to plain carbon, low carbon, and high alloy steels, and to several non-ferrous metals, including nickel-copper and copper-silicon alloys.
Applications
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Forge Welding The Blacksmith’s Art
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Solid
State
Welding
Electrical
Chemical
Mechanical
RadiationPressure &
Deformation
Forge
Weld
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Forge Welding
Forge welding is a solid-state welding process
that produces a weld by heating the work pieces
to welding temperature and applying blows
sufficient to cause permanent deformation at the
faying surface. Forge welding was the earliest
welding process and the only one in common use
until the 19th century.
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AWS Welding Handbook
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Fluxes
Often fluxes are needed to prevent oxide formation on the
parts to be welded. Two commonly used fluxes for steels
are silica sand and borax (sodium tetraborate).
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ROLL BONDING
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Nascent Surface
• Defined as the new surface formed during compressive plastic deformation (upset).
• Can be free of oxides and contamination.
• Increased nascent surface area usually results in increased weld strength.
Area increase under compressive
plastic deformation (upset)
Original
Deformed
Interface
Nascent
Surface
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Roll Bonding • A solid state welding process in
which bonding is made between two sheets of metal by passing them through a rolling mill.
• Surface preparation is of utmost importance.
• Welding is promoted with increasing temperature, increasing pressure, increasing roll diameter, and decreasing rolling speed.
• 60 to 70% deformation is required for maximum weld strength.
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a
Nascent surface
Original weld
interface
X
Y b
Weld
interface
Rolling
Plane Strain Roll Bonding
(Deformation in thickness and length only.)
• % reduction in thickness
• % nascent (new) surface
x a
x
a
x100% 1 100%
b y
b
y
b100% 1 100%
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Plane Strain Roll Bonding
• Assuming constant volume, xy = ab or a/x = y/b
• % reduction in thickness is equal to % nascent surface, assuming no change in width.
• For 100% nascent surface 100% reduction in thickness is needed.
1 100% 1 100%
a
x
y
b
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Surface Deformation • Bulk compressive deformation
or upsetting is measured as the percentage reduction in sheet thickness.
• A threshold deformation exists below which no weld is made.
• Above this threshold the joint strength is close to that predicted by assuming the welded area is the nascent surface area.
• Increasing the temperature reduces the value of threshold deformation.
Deformation%
Threshold
deformation
Predicted strength
Strength of welded joint.
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Steel - Aluminum Cladding
Cleaning
Rolling
a. Cold
b. 600-750 F
Post-Heating ~ 1000F
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Aluminum
Steel
FeAl3, Fe2Al5 (Brittle)
Si > 0.25% in Steel
Tends to Reduce
Brittle Iron-
Alumindes Thus
Higher Post Roll
Temperatures can be
employed Steel
Steel
Aluminum
Steel
Steel
Aluminum
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Titanium
Aluminum
Aluminum - Titanium
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Aluminum
Stainless Steel
Stainless Steel Clad Aluminum & Copper
Copper Stainless Steel
Hot Rolled