17 Jun 2021



Cold bonding can be described as the joining of two parts or materials without the use of heat. Traditional bonding techniques such as welding use high temperatures generated by an electric arc or the burning of gases to ‘melt’ the materials so that they fuse into one. Cold bonding on the other hand is achieved with the use of an adhesive.



Welding is one of the most recognised bonding techniques; however, it also presents several challenges related to:
a. Safety
b. Downtime 
c. Defects that can lead to failures


With cold bonding, there is no risk of sparks or electrical hazards and no need for hot work permits. It can be used when cutting and welding are restricted due to potentially explosive atmospheres. The risk of sparks can limit the applications where welding is acceptable, especially in potentially explosive atmospheres or places such as oil tanks and offshore platforms. A single spark created while welding can cause a fire or even an explosion. Initiatives to minimise the risks of hot work have been implemented for many years, but accidents still happen. Toxic gases produced during the welding process can negatively impact the welder in confined spaces and affect the environment.

Downtime is required in environments where welding is done at high-risk environments where it has a possibility to cause a fire or explosion due to sparks and heat. 

It will also affect the production of the company as the equipment needs to be degassed prior to application, the surface has to be machined back to the initial profile and once the application has been completed, the equipment needs to be stress relieved. 

Welding can be a time-consuming process due to the number of necessary steps required to carry out the application. The required post-weld heat treatment and inspection further extend downtime.

Defects and failures.
Galvanic corrosion commonly occurs if the filler or parent metals are dissimilar. In addition, the heat generated by welding can lead to the creation of heat-affected zones (HAZ), which can also cause increased corrosion. 

Residual stresses caused by uneven expansion-contraction change the structure and the properties of the metal and can lead to potential material degradation. 

Voids and porosity may also occur during the welding process. These can weaken the weld joint if not repaired and can be difficult to detect if they are not visible on the surface of the weld.




Welding has been a popular choice or option in various industries for years, but with time, innovation and technology has introduced a more efficient way that’s malleable to future improvements. One of the ways innovations is Belzona. 

Belzona bonding was first used in the late 1950s to attach equipment ID tags. Over the years, materials were enhanced to resist higher pressures and temperatures as well as demonstrate comparably higher adhesion and compressive strength.




The Belzona cold bonding key benefits are as follows:


  • High adhesion

Ensures long service life.

  • Ambient cure.

Rapid achievement of full mechanical properties.

  • Efficient.

Uniform and efficient load transfer.

  • No shrinkage.

Materials are 100% solids.

  • Durable.

The system withstands industrial environments.

  • Resistant.

Chemical, pressure and temperature resistance.

  • Mechanical strength.

Capable of handling a wide range of loads.


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