Crush Testing

Plastics pipes and fittings- Crushing decohesion test for polyethylene (HDPE) electrofusion assemblies

The purpose of the test is to assess the cohesion of the HDPE Pipe and electrofusion socket or saddle weld assemblies this is done by summiting a force and crushing the test sample.

The decohesive strength of the fitting assembly is charactized by the nature of the failure in the plane of the welded fused material and by percentage decohesion.

The appearance and location of the failure is taken into account in assessing the strength of the assembly.

An electrofusion coupling weld sample is machined to give a weld sample that is subjected to a tensile stress on the mechanical test machine set at constant speed of 100mm/minute in our laboratory. When loading the test samples in one of our 100kN mechanical testing machines that have state of the art software which allows for the choreographing of the test information in an easy to view format, providing graphs and calculations automatically.

When sending Electro fusion test welds to the lab for testing they are required to be cut 200 mm either side of the electrofusion coupling and sent along with the test documents filled out for each test piece with all the information that is required on the NATA report. The test welds need to be clearly marked, with a project number, welder personnel identification number and name, weld joint identification number and welding machine ID and date welded.

Crush testing of electro fusion fittings is an essential means of ascertaining the integrity of electrofusion welds produced and helps identify poor quality production welds and products at the earliest stage, before it has the potential to become a costly error.

PIPETEST AUSTRALIA can do all your testing leaving the client with confidence in the work being carried out in a quality standard. We provide a service for making sure your next project runs well by verifying welding machines, qualifying the welding personnel and verifying welding parameters and procedure at the start of the project and during installations or production.