Common Joint Configurations Butt JointĪ connection between the ends or edges of two parts making an angle to one another of 135-180° inclusive in the region of the joint. This is a fast process which allows wood to be joined without adhesives or nails in a matter of seconds. The materials to be joined are subjected to a great deal of pressure before a linear friction movement creates heat to bond the workpieces together. Wood welding uses heat generated from friction to join the materials. Joining methods for plastics can be separated into external or internal heating methods, depending on the exact process used. Plastics welding also uses heat to join the materials (although not in the case of solvent welding) and is achieved in three stages.įirstly, the surfaces are prepared before heat and pressure is applied and, finally, the materials are allowed to cool to create fusion. It can also use a shielding gas to protect the melted and filler metals from becoming contaminated or oxidised. Pressure can also be used to produce a weld, either alongside the heat or by itself. Heat at a high temperature causes a weld pool of molten material which cools to form the join, which can be stronger than the parent metal. Typically with the addition of a filler material. Different types and what they are used forĪs opposed to brazing and soldering, which do not melt the base metal, welding is a high heat process which melts the base material.The completed welded joint may be referred to as a weldment. The form of these materials may see them referred to as parent plate or pipe, filler wire, consumable electrode (for arc welding), etc.Ĭonsumables are usually chosen to be similar in composition to the parent material, thus forming a homogenous weld, but there are occasions, such as when welding brittle cast irons, when a filler with a very different composition and, therefore, properties is used. The material added to help form the join is called filler or consumable. The parts that are joined are known as a parent material. A number are considered ' unweldable,' a term not usually found in dictionaries but useful and descriptive in engineering. Some materials require the use of specific processes and techniques. Welding is a fabrication process whereby two or more parts are fused together by means of heat, pressure or both forming a join as the parts cool. Welding is usually used on metals and thermoplastics but can also be used on wood. The completed welded joint may be referred to as a weldment. National Structural Integrity Research Centre.Structural Integrity Research Foundation.
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