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Dissimilar metal weld transitions

bimetal weld joint transition

The easiest way to weld dissimilar metals

Anybody from an architect to a trailer manufacturer can benefit from BiMetal weld transitions. Spur’s transitions make connecting dissimilar metals easy. Traditional welding processes, such as MIG and TIG welding, can be used. Simply weld each side of the roll bonded metal component to its respective metal structure and the permanent bond of the weld transition takes care of the rest.

Customers have used Spur's weld transitions for decades. The roll bonded Spur interface has low porosity and minimal risk of galvanic corrosion. In addition, Spur saves cost and weight by directly bonding alloy aluminums without the need of a low strength interlayer.


  • High weld temperature resistance
  • Uniform bond for low corrosion
  • Direct bonding of alloy aluminums without an interlayer

bimetal weld transition

The result of Spur's rolling process is uniformly bonded bi-metal transitions that can withstand welding temperatures. The bond has a strength greater than the weaker of the two metals making a strong permanent connection.


aluminum to steel bimetal weld strip
Weld Strip


Steel to Aluminum
steel to aluminum dissimilar metal weld junction

Each side of the transition is welded to its own respective metal resulting in a permenant dissimilar metal connection that eliminates corrosion.

  • Materials 1050/A36 - Custom versions available
  • Bond Strength > Aluminum Strength (75MPa / 11,000psi)
Standard Parts standard bimetal weld transition
Weld Transition (in) Part Number
Width Length Thickness 1050 AL
A36 ST
.5 2 .75 40-10023
.5 3 .75 40-10024
.5 4 .75 40-10025
1 2 .75 40-10026
1 3 .75 40-10027
1 4 .75 40-10028


The optimal weld transition is wide enough to provide the strength needed to support the structural transition and loads. The bond strength will exceed the strength of the aluminum and thus the aluminum strength should be used for stress analysis. With a temperature limit of 400C during welding, the thickness of the bond is ideally 3/8 inch or greater for supporting traditional welding techniques such as MIG, TIG, arc and gas.

  • The most common metal combination is A36 and 1050, but alloy aluminums are supported
  • Bond strength is greater than the aluminum
  • Recommended layer thickness of 3/8 inches
  • Do not exceed 400C during welding