Butt joint
Butt joint turns up in 2 fields: adhesives, woodworking. Here is what it means to the people in each one.
Butt joint in adhesives
A joint where two parts are bonded end to end, with only the small end area carrying the load.
Butt joints offer little bond area and load the adhesive in tension and cleavage, so they are the weakest common geometry for adhesives. Any misalignment or bending turns into peel at one edge. Designers avoid them or convert them into lap, scarf, tongue-and-groove or strap joints. They show up mainly in tensile test specimens and in sealing jobs where strength matters less.
"Butt joint on that tube end is just asking for it, sleeve it or scarf it."
Butt joint in woodworking
A simple connection where the ends or edges of two workpieces meet squarely without interlocking parts.
Two pieces of wood are joined by simply placing their ends or edges together and fastening them with glue, nails, or screws. It is the weakest and most basic joint because it relies entirely on the fastener or adhesive, often bonding porous end grain to side grain.
"We can use a simple butt joint for the base frame since it will be entirely hidden and reinforced with corner blocks."