While welding is a favoured method for permanently joining two parts due to the high resultant strength, however it is not a good option when joining thin metals or when joining dissimilar metals (with different melting points) like Aluminum or Stainless Steel. To prevent distortions and melt throughs due to welding the industry has started using structural adhesives.
Limitations with conventionally used methods:
- High welding temperatures deform thin panels (causing warping and rippling effects)
- Very challenging to weld dissimilar metals as they have different melting points
- Blemishes and melt through occurs despite being careful
- Offline repairs need to be done to meet aesthetic requirements
- Labour, equipment and time intensive process
- Incorrect filler material selection can lead to corrosion and premature welding failure
The same strength (if not slightly better) as compared to overlap welding
Cost almost half of overlap welds
3 to 5 times faster productivity than overlap welds
No specialized skill, equipment or post preparation process requirement
Bonds and seals together
Works well on thin metals or dissimilar metals (no distortions)
Produces aesthetically pleasing joints
Bonding of mild steel plates to panels in storage cabinets/racks
Bonding of thin cast alumimium housing parts with high rigidity for a new compact storage module
Bonding powder coated panels with stainless steel in dehumidifiers
Bonding of stainless-steel panel to a painted mild steel panel hinge in a portable
Bonding of Alumunium alloy floor panel to frame in boats
Bonding thin wall stainless steel panels to frame in baking ovens
Increasing design flexibility to accelerate production process
A storage module maker used LOCTITE to assemble thin cast aluminum housing parts on their new product design to make it lightweight.Know More
Cutting down production cost by simplifying the manufacturing process
A crane manufacturer was able to join dissimilar metals using LOCTITE for a planned addition to their cranes.Know More
Increasing productivity by simplifying the manufacturing process
A dehumidifier manufacturer used LOCTITE to join powder-coated panels with stainless steel cabinets without welding to pass their impact test requirements.Know More
Clean the panels to be bonded with solvent to remove any loose debris or oil residues
Apply a bead of LOCTITE Structural adhesive using a dual cartridge dispenser (in case of acrylics) or a pneumatic cartridge dispenser (in case of SMP)
Place the panel on the frame and clamp briefly till the adhesive fixtures
Looking to improve the reliability of your assemblies?
Learn how LOCTITE Structural Bonding solutions can help you in achieving reliable results with maximum strength.
Looking for professional advice?
Talk to our expert for first-hand information for achieving reliable results with LOCTITE Structural Bonding solutions.
We have been using welding for our structural requirement. Will structural adhesives be able to achieve the right strength?
LOCTITE structural adhesives have been proven to be able to take almost as much load as overlap welding and that too at only half the cost. LOCTITE adhesive also offer other advantages like making the process simple, and providing sealing along with bonding.
We use adhesive tapes. It is not messy. Wouldn’t using LOCTITE adhesives increase the process time and cost?
While double sided adhesive tapes are not messy, their application process is definitely very long and complicated – what with the need to cut to specific dimensions and expensive activators. LOCTITE adhesives are mostly applied through static mixers that ensures precise application without any mess.
We are using polypropylene and we have tried to use multiple methods and adhesives before, but they didn’t work. Which LOCTITE adhesives would be suitable?
There are many suitable LOCTITE structural adhesives based on acrylic, epoxy, modified silane and hybrid technologies that would be ideal for bonding polypropylene. Drop a query to our LOCTITE experts with the specifics of the application requirement and they will be able to recommend the right solution.
Replacing rivets is out of question – if we use adhesives, it will take longer to bond but with rivets we would be able to assemble instantly.
Rivets offer the advantage of instant assembly, however result into concerns of reliability because of uneven stress concentrate points that become fatigue and failure points and also lead to corrosion. Instead, LOCTITE structural adhesives offer better reliability and come in various cure types which can be further accelerated with the help of activators.
Can LOCTITE products withstand loads under extreme humidity and temperature conditions?
Yes, LOCTITE structural adhesives have been designed to withstand heavy loads under various ambient conditions. Especially, LOCTITE structural adhesives based on modified silane technology which cure in the presence of humidity, are excellent for outside applications where high temperature, UV resistance etc. features are preferred.
Which LOCTITE structural adhesives can bond rubber to metal?
LOCTITE structural adhesives based on acrylic, epoxy, modified silane technology and hybrids are excellent for bonding rubber to metal. Drop a query to our LOCTITE experts with the specifics of the application requirement and they will be able to recommend the right solution.
Is it possible to bond glass to glass or glass to metal with LOCTITE adhesives?
Yes, bonding dissimilar substrates like glass to metal or even glass to glass is possible with LOCTITE adhesives. If optical clarity and aesthetics is a must, choose clear epoxies like LOCTITE E-30 CL. Otherwise LOCTITE acrylics are also a great choice for bonding glass to metal or glass to glass. Prefer modified silanes if glass has to be fixed to a metallic frame. Drop a query to our LOCTITE experts with the specifics of the application requirement and they will be able to recommend the right solution.
Is any surface preparation needed before applying LOCTITE structural adhesives?
Removal of dirt, dust or other surface impurities from the surfaces to be bonded is important before adhesive application as they can interfere with the effectiveness of the bond strength. This can be achieved through either degreasing or abrasion. Chemical treatments like primers, corona discharge, flame and plasma treatments can also be used to modify the surface properties to further enhance bond strength.
What is meant by open time/working time/pot life of an adhesive?
Open time is the time within which parts should be assembled post application of the adhesive to ensure proper surface wetting and achieve maximum strength.
What does on part life of adhesive signify?
This term is relevant for adhesives where activator is used on one of the parts. On-part life is the time within which activator or primer provides full performance.
What is the difference between fixture time and full cure time?
Fixture time of an adhesive is the time needed to achieve enough strength to hold the parts together without additional support or to achieve lap shear strength of 0.1 N/mm2 whereas full cure time of an adhesive is the time needed to achieve full performance.
What is a hybrid adhesive?
Combination of two different adhesive technologies, which are normally stand-alone technologies and at the outset cannot be manually mixed. A Hybrid combines the positive attributes of both technologies which provides new performance parameter. LOCTITE Hybrid adhesives combine the speed of cyanoacrylates (commonly known as instant adhesives) with the strength of epoxies/acrylates to give universal that can bond anything in seconds providing high strength.