Copper and Aluminum Transition Joints

Product Description

Copper and Aluminum Transition Joints

Aluminum bimetal -----Structure Transition Joints

Cladding is a process in which a minimum of two different types of metal are joined to form an inseperable "laminated" material. These Clad Materials are produced through our Cold Rolled Bonding process, which we developed more than 50 years ago.

CHALCO aluminum's structure transition joints aluminum bimetal are commonly used to make a welded and maintance free connection between alloyed aluminum components and steel structures in the shipbuilding, railway and automotive industry.

The major shortcomings of rivets and bolts are that they require holes to be drilled, need special insulators and require regular assembly inspection. Any removal of material, such as drilling holes, also weakens the metal.
 
Aluminum bimetal--Structure transtion joints are an indisputably better option because they eliminate crevices and have shown to limit crevice corrosion. Aluminum bimetal - Transition joints require no extra hardware, which allows engineers to stream-lin, their designs and shave off extra weight..
 

Types	Temper	Features
CA100	No transition layer	higher cost performance
CA101	Thin transition layer	High bonding strength
CA200	Thick transition layer	Ultra-high bond strength

 

	CA 100	CA 101	CA 200
Interface bonding rate	100%	100%	100%
Tension strength	>85 Mpa	>110 Mpa	> 210 Mpa
Shearing strength	>65 Mpa	>85 Mpa	> 137 Mpa
Highest temperature	315ºC×30 min	400 ºC × 30 min	500 ºC × 30 min

Aluminium alloy clad steel for brazing type exchanger

The material mark and specification of cladding strip
 

Material mark				Specification /mm
Mark	Non-clad Layer	Double side Cladding Aluminium Layer	Base mark	Cladding Strip thickness	Cladding Strip width	Cladding Layer width	Non-alu. Edge width
4A60/08A1	4A60	__	08A1	0.21-2.0	50-500	0.05-0.1	2.0-4.0
Cladding Aluminum 4A33/08A1	___	Cladding aluminum 4A33		1.5-5.5	60--300	0.3-1.5	0
Cladding aluminum 7A16/08A1		Cladding aluminum 7A16
Cladding aluminum 8A60/08A1		Cladding aluminum 8A60
Cladding aluminum 8A61/08A1		Cladding aluminum 8A61
Cladding aluminum 8A62/08A1		Cladding aluminum 8A62

 
Chemical composition

Alloy Sign

Chemical Composition

Si

Sn

Fe

Ni

Cu

Mn

Mg

Zn

Pb

Ti

Single

Sum

Al

4A33

10.0- 12.0

<=0.2

<=0.3

<=0.1

0.7- 1.3

<=0.1

__

__

__

<=0.1

<= 0.05

<= 0.15

Remind

4A60

0.8- 1.0

__

0.2- 0.35

__

<= 0.05

<= 0.03

<= 0.3

<= 0.05

__

<= 0.03

<= 0.05

<= 0.15

7A16

1.0- 2.0

<=0.2

<=0.6

<=0.2

0.8- 1.2

<=0.3

<= 0.6

4.4- 5.5

0.7- 1.3

<=0.2

<= 0.05

<= 0.15

8A60

<= 0.7

5.5- 7.0

<=0.7

<=1.3

0.7- 1.3

<=0.7

__

__

__

<=0.2

<= 0.05

<= 0.15

8A61

__

10.0- 14.0

1.8- 3.5

<=0.1

0.4- 1.3

<= 0.35

__

__

1.0- 2.5

<=0.1

<= 0.05

<= 0.15

8A62

<= 0.7

17.5- 22.5

<=0.7

<=0.1

0.7- 1.3

<= 0.7

__

__

__

<=0.2

<= 0.05

<= 0.15

Cladding layer thickness bias ,base body surface roughness

Cladding layer sign	Cladding layer thickness / mm	Cladding layer thickness Bias / mm	Base body surface Roughness R/um
4A60	0.05-0.100	+- 0.004	__
Cladding aluminium 4A33  7A16  8A60 8A61  8A62	0.4 - 0.8	+- 0.07	<= 0.63
	>0.8-1.0	+-0.08
	>1.00	+-0.09

Cladding Strip no edge width bias

Cladding Strip Width	Non-edge width bias
50.00-100.00	+- 0.30
>100.00-300.00	+- 0.50
>300.00-500.00	+- 1.00

Burr ,Stagger floor ,Tower-shaped

Cladding Strip Width	Burr	Stagger floor	Tower floor
0.200-0.500	<=0.06	<=1.0	<=10
>0.500-1.000	<=0.10	<=2.0	<=15
>1.000-2.000	<=0.15	<=2.5	<=20
>2.000-- 5.500	<=0.20	<=3.0	<=25

Side Curvature

Cldding Strip Width / mm	Side Bending degree / mm
50.00-100.00	3.0
>100.00-300.00	2.0
>300.00-500.00	1.5

Surface  Hardness

Product Sign	Aluminium hardness in Cladding Layer / HB		Base body Hardness / HBW
	A grade	B grade
Cladding Alu. 4A33 /08A1	45-60	---	160----220
Cladding Alu.7A16 / 08A1	45---70	70---100
Cladding Alu.8A60 /08A1	35---45	---
Cladding Alu.8A61 /08A1	35---45	---
Cladding Alu.8A62 /08A1	30---40	---