The strength of an electrofusion joint is measured using tensile and peel tests on coupons taken from the fusion zone of the joint. Two methods have been developed to assess the effect of fusion time on joint strength: 
# Simulating an electrofusion joint solely for testing purposes
# Removing test coupons from standard electrofusion welded joints
The strength of the joint develops throughout the welding process, and this development is affected by the fusion time, joint gap, and pipe material. These are detailed below.