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Glossary
H
Hammer stop
The hammer motion in light rotary hammers can be switched off to drill in wood or steel.
Hardening processes
There are several hardening methods for steel. The methods and their effects on the workpiece are briefly described as following.
Full hardening
By heating and subsequent cooling down to room temperature, the workpiece is hardened through to its core. This method can produce in form of changes (warping) and cracks (brittle).
Annealing
Annealing means heating a workpiece up to and maintaining a temperature of 200 to 600 °C over a prolonged period of time with the purpose of increasing the toughness of the hardened material after chilling to maintain the partial texture change. Annealing reduces the hardness of the material.
Artificial ageing
Also known as temper hardening. Means annealing in the upper temperature range.
Case hardening
Here the carbon content of the outer layer of the workpiece is increased (carbonisation). If nitrogen is added to this process, this is referred to as carbonitration.
While formerly this process involved the use of molten salt, today it is accomplished with gas for environmental reasons. With case hardening you can obtain very hard outer layers on the workpiece surface while the core maintains its original toughness. This process can be controlled to increase the thickness and hardness of the outer layer.
Boronising
This hardening process involves the use of boron to increase the resistance to wear in the outer layer.
Full hardening
By heating and subsequent cooling down to room temperature, the workpiece is hardened through to its core. This method can produce in form of changes (warping) and cracks (brittle).
Annealing
Annealing means heating a workpiece up to and maintaining a temperature of 200 to 600 °C over a prolonged period of time with the purpose of increasing the toughness of the hardened material after chilling to maintain the partial texture change. Annealing reduces the hardness of the material.
Artificial ageing
Also known as temper hardening. Means annealing in the upper temperature range.
Case hardening
Here the carbon content of the outer layer of the workpiece is increased (carbonisation). If nitrogen is added to this process, this is referred to as carbonitration.
While formerly this process involved the use of molten salt, today it is accomplished with gas for environmental reasons. With case hardening you can obtain very hard outer layers on the workpiece surface while the core maintains its original toughness. This process can be controlled to increase the thickness and hardness of the outer layer.
Boronising
This hardening process involves the use of boron to increase the resistance to wear in the outer layer.
Headstock
The headstock is used to mount the drive motor in a lathe.
Headway
The shape of the angle on angle drills determines their application range. The headway is the distance from the top of the transmission housing to the bottom of the drill chuck. It determines the usability of the machine in narrow areas.
Heavy metals
Expression for metals with a higher specific weight than iron or steel, i.e. non-ferrous metals, lead, uranium, etc. Some heavy metals can form highly poisonous chemical compounds.
Hose connector
This is a water technology accessory used to connect two hoses. Damaged hoses are repaired by cutting out the damaged section and linking the two ends with the hose connector.
Hose/tap connector
In water technology the joining piece between hose and working tool or the hose/tap connector.
Hot-melt adhesive
Adhesives which melt and become liquid when hot.
Hot-melt glue gun
Pistol-shaped device for the heating and application of hot-melt adhesive.
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