{"id":1768,"date":"2009-07-23T11:56:58","date_gmt":"2009-07-23T11:56:58","guid":{"rendered":"https:\/\/permabond.com\/why-use-adhesives\/"},"modified":"2023-07-17T17:07:54","modified_gmt":"2023-07-17T17:07:54","slug":"why-use-adhesives-or-mechanical-fasteners","status":"publish","type":"post","link":"https:\/\/permabond.com\/es\/why-use-adhesives-or-mechanical-fasteners\/","title":{"rendered":"Why use adhesives over mechanical fasteners?"},"content":{"rendered":"

Selecting an Adhesive or Mechanical joining method?<\/strong><\/h2>\n

Some people are more inclined to trust a mechanical joining method, such as a rivet or weld over an adhesive, to secure two things together. Adhesives, however, overcome the limitations found in traditional methods of joining plastics and metals.<\/p>\n

When it comes to joining plastics, mechanical fasteners, ultrasonic welding, and solvent welding, all have their place. However, listed below are some common limitations of processes that adhesives can help solve.
\n<\/p>\n

Adhesive or Mechanical Joining Method for Plastics?
\n<\/strong><\/h2>\n

Mechanical Fasteners for Plastics<\/strong><\/h3>\n

Create stresses in the plastic\/rubber that could lead to distortion or cracking
\nRequire altering the design to allow for holes
\nCreate appearances that can interfere with the styling of the end product
\nConcentrate all the holding power at the fastener location causing the applied force to be carried by a small area of the plastic or rubber.<\/p>\n

Ultrasonic Welding<\/strong><\/h3>\n

Cannot be used on thermosets
\nCannot be used to join plastics\/rubber to other substrates such as metal or glass
\nRequires tighter design tolerances (small area to concentrate the ultrasonic energy is desirable)
\nLimits the capability of joining different thermoplastics in the same assembly
\nRequires a large investment in machinery<\/p>\n

Solvent Welding<\/strong><\/h3>\n

Cannot join plastics\/rubber to other substrates such as metal or glass
\nCannot join thermoset plastics\/rubber
\nHas a tendency to cause stress cracking
\nRequires pre-set and consistent time between the application of the solvent and mating of the parts<\/p>\n

Solvent Cements<\/strong><\/h3>\n

Have poor resistance to heat and solvents
\nEmit fumes that may be toxic or flammable
\nRequire ventilation
\nHave extensive drying time
\nRequire design to avoid trapped solvent which may lead to weakness
\nHave poor gap filling capability
\nRequire a long time to achieve full strength<\/p>\n

Adhesive or Mechanical Joining Method for Metals?<\/strong><\/h2>\n

As with plastics, methods of joining metals include mechanical fasteners and thermal joining methods. So, to determine if an adhesive or mechanical system is best for your application, review the limitations in these mechanical methods that adhesive<\/a> joining can overcome listed below.<\/p>\n

Mechanical Fasteners for metals<\/strong><\/h3>\n

Create stress concentration points
\nAre visible additions to the joint or seam
\nLimited load distribution points<\/p>\n

Welding, Brazing & Other Thermal joining methods<\/strong><\/h3>\n

Distort components
\nRequire secondary operations (painting, grinding) to achieve an aesthetically pleasing appearance
\nJoin similar materials only<\/p>\n

 <\/p>\n

Common Reasons to Choose Adhesives over Mechanical methods<\/h3>\n

Throughout this list, there are some common threads in selecting an adhesive or mechanical joining system, including a) engineering adhesives<\/a> are designed to join dissimilar materials, for example, plastic to metal, and b) adhesives distribute the stresses over the desired area instead of concentrating stresses, and c) that adhesives do not destruct or distort the substrates.<\/p>\n

For further help and advice, please contact <\/a>Permabond.<\/p>\n","protected":false},"excerpt":{"rendered":"

Selecting an Adhesive or Mechanical joining method? Some people are more inclined to trust a mechanical joining method, such as a rivet or weld over an adhesive, to secure two things together. Adhesives, however, overcome the limitations found in traditional methods of joining plastics and metals. When it comes to joining plastics, mechanical fasteners, ultrasonic […]<\/p>\n","protected":false},"author":5,"featured_media":11855,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[607,612],"tags":[42,57,255,45,46,58,43,47,48],"class_list":["post-1768","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-adhesive-selection-and-use","category-tips","tag-adhesives","tag-cyanoacrylates","tag-engineering-adhesives","tag-fabric-adhesives","tag-instant-adhesive","tag-light-curable-adhesives","tag-permabond","tag-plastics-adhesive","tag-wood-adhesives"],"acf":[],"yoast_head":"\nAdhesive or mechanical | Why Use Adhesives? | Adhesive Bonding<\/title>\n<meta name=\"description\" content=\"Selecting an Adhesive or Mechanical joining method? 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