Tuesday, 27 06 2017
Onsite welding are experts in the field of Aluminium welding and phosphorous metal welding. This is a highly specialised area that you can trust Onsite Welding in.

The corrosion resistance of aluminium is due to a tough oxide layer on the surface. This oxide layer has a higher melting point than aluminium and must be removed before welding. It is removed using chemical, mechanical or electrical means and must be prevented from reforming before welding can be completed.

Due to the high thermal conductivity of aluminium, heat needs to be applied at a rate four times that needed for steel. It has a linear expansion coefficient twice that for steel, which must be considered when welding material that has been restrained.

Aluminium has a relatively low melting point and unlike steel, it does not change colour as its melting point is approached.
Consequently, care must be taken not to overheat and/or melt aluminium during joining processes.

Welding tends to reduce the mechanical properties of aluminium in the heat affected zone. This area extends around 25mm from the weld.