First of all, we will explain about WHAT exactly does welding oven do.
Welding oven is used to keep welding rods / electrodes or submerged arc welding flux at optimum temperatures to keep them dry (free from moisture) when subjected to welding application.
Now, the question arises WHY there is a need to dry welding electrode or flux.
MMAW electrodes must be stored at right temperatures in order to obtain quality weld deposits. Damp electrodes or flux with too much of absorbed moisture from atmosphere leads to weld cracking and porosity. Operational characteristics may also gets affected negatively.
If a welder experiences unexplained weld cracking or a deteriorated weld arc performance, it may due to inappropriate electrode storage or re-drying procedures. So the electrodes must be dried appropriately at right temperatures before subjected to use.
WHY do moisture or dampness negatively affects weld deposit quality?
The use of flux in flux coated electrodes or welding electrodes is to shield the weld area from oxygen present in the atmosphere. Oxygen is very harmful if present inside the molten weld pool causing weld cracking and porosity. When electric current passes through welding electrode in stick welding process, the bare rod metal and base metal melts down to form a molten weld pool, which on solidification becomes a strong joint. And the coated flux molecules breaks down into an inert gas combination which forms a shield or blanket over the molten weld pool and resists the atmospheric oxygen to enter inside the weld pool.
If the coated flux contains moisture and without drying subjected to welding, the moisture carrying oxygen within will be present inside the weld pool, adversely affecting the weld deposit quality. It may lead to serious accidents too.
- Size: Welding ovens comes in varying sizes and storing capacities. Analyze your need first before buying a portable or mother oven.
- Built: Look out for the built quality whether made from sufficient sheet thickness or not.
- Heating Coils: Air heating elements must be of stainless steel grade for long lasting life.
- Digital Temperature Control: Digital temperature control over analog type of control must be preferred for greater drying or re-drying accuracy.
- Wire Connection: Check for wire connections, each wire must be end crimped with suitable cable socket to avoid short circuit.
- Siphoning System: There must be a provision for moisture steam evacuation in the oven to avoid any rusting problem.
- Thermal Insulation: The thermal insulation between the layers must be adequate and tightly filled to keep the heat inside the working chamber intact and avoid any heat loss. This would result in fast drying of electrodes thus, valuable resource saving.
- Rubber Insulation: Bottom stand of the oven body that comes in contact with the work job must be insulated with rubber to avoid any transfer of earthing current to the oven body.
Having all of the above characteristics makes the welding oven of an ideal quality that a welder must possess for easy and long lasting working.