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2. Plastic welding - Wikipedia

   en.wikipedia.org/wiki/Plastic_welding

   With speed welding, the plastic welder, similar to a soldering iron in appearance and wattage, is fitted with a feed tube for the plastic weld rod. The speed tip heats the rod and the substrate, while at the same time it presses the molten weld rod into position. A bead of softened plastic is laid into the joint, and the parts and weld rod fuse.

3. Hot gas welding - Wikipedia

   en.wikipedia.org/wiki/Hot_gas_welding

   Hand welding is a technique in which the weld rod is applied to the joint by the welder directly. This is also referenced as free-hand welding or fan welding. [1] The hot gas torch is maneuvered in one hand to heat both the weld rod and joint surfaces in a pendulum manner in quick succession.

4. Rotary friction welding - Wikipedia

   en.wikipedia.org/wiki/Rotary_friction_welding

   Rotary friction welding is widely implemented across the manufacturing sector and has been used for numerous applications, [17] [18] [19] including: Parts in gas turbine such as: turbine shafts, turbine discs, compressor drums, [20]

5. Spin welding of polymers - Wikipedia

   en.wikipedia.org/wiki/Spin_welding_of_polymers

   Like all other welding methods this process utilizes heat, time, and pressure to create a weld joint. Heat is generated via internal friction generated between the two parts when rotating and subjected to a load normal to the weld joint. This frictional heat causes the plastic to melt and a bond to be created. [1]

6. Weldability - Wikipedia

   en.wikipedia.org/wiki/Weldability

   While weldability can be generally defined for various materials, some welding processes work better for a given material than others. Even within a certain process the quality of the weld may vary greatly depending on parameters, such as the electrode material, shielding gases, welding speed, and cooling rate. [1]

7. Welding - Wikipedia

   en.wikipedia.org/wiki/Welding

   Consumable electrode processes such as shielded metal arc welding and gas metal arc welding generally use direct current, but the electrode can be charged either positively or negatively. In welding, the positively charged anode will have a greater heat concentration, and as a result, changing the polarity of the electrode affects weld properties.