User:HayleeMcConnell/sandbox

Induction welding was first discovered by Michael Faraday. The basics of induction welding explain that the magnetic field's direction is dependent on the direction of current flow. and the field's direction will change at the same rate as the current's frequency. For example, a 120Hz AC current will cause the field to change directions 120 times a second. This concept is known as Faraday's Law.

When induction welding takes place, the work pieces heat up to under the melting temperature and the edges of the pieces are placed together impurities get forced out to give a solid forge weld.

Induction welding is used for joining a multitude of thermoplastics and thermosetting matrix composites. The apparatus used for induction welding processes includes a radio frequency power generator, a heating station, the work piece material, and a cooling system.

The power generator comes in either the form of solid state or vacuum tube and is used to provide an alternating current of 230V-340V or a frequency of 50-60Hz to the system. This value is determined by what induction coil is used with the piece.

The heat station utilizes a capacitor and a coil to heat the work pieces. The capacitor matches the power generators output and the induction coil transfers energy to the piece. When welding the coil needs to be close to the work piece to maximize the energy transfer and the work piece used during induction welding is an important key component of optimal efficiency.

Some equations to consider for induction welding include:

Thermal calculation: $$\bar{Q}(x, t)= {\eta(J_0^2)\rho \over C_r}$$

Where: $$C_r$$is thermal mass

$$\rho$$is resistivity

$$\eta$$is efficiency

$$J_0$$is surface density

Newton Cooling Equation: $$q^n=h(T_s-T_B)$$

Where: $$q^n$$is heat flux density

h is the heat transfer coefficient

$$T_s$$is the temperature of the work piece surface

$$T_B$$is the temperature of the surrounding air