Welding carbon tool steel
Are you interested in welding of carbon tool steels from the vendor — company Electrocentury-steel? Here you will find only reliable information on this topic
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Common features of welding process
Carbon tool steel are materials of low weldability. The reason is the technology of melting steel in induction or arc furnaces. As a result, the percentage of carbon in a steel is increased, and the metal appears fairly great sensitivity to any overheating, which further complicates the welding process. In addition, the process of obtaining carbon tool steel is greatly influenced by the presence of oxygen-containing inclusions that have a negative influence on the indicators of fragility.
To reduce this impact there are two methods of welding — friction and electric resistance welding. Common to these technological solutions is that immediately before the compound became heated. The temperature of such heating is determined by the percentage of carbon less than his, so it may be lower. Обычный1 interval preheating temperature of 350…4000 C. After welding requires a low annealing up to 160…1800С, after which removed residual stresses, and less warpage of the welded articles.
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When the friction welding connection is due to the heat, which is released at the interface between the welded parts. If friction welding is used, mechanical energy is friction between the rotating in opposite directions the parts that are simultaneously compressed by an axial force, the contact welding heating occurs because of heating effect of electric current flowing through the welding zone.
As a kind of butt welding, friction welding carbon tool steel has the following advantages:
Sufficiently high performance;
Stable quality formed connection;
The increased efficiency of the process.
At contact welding of carbon tool steels, the specific energy, which should be applied to the joints is from 18 to 20 watts/mm2 (for steels containing 0,7…0,9% carbon) up to 130…150 W/mm2, for tool steels, which contain 1.2…1.3% of carbon (increase in the area of the junction, the specific energy of the process also increases). After the connection details for a while, during your cool down, still under the influence of axial compressive stress.
When welding in the connection area develop temperatures of up to 1000…11000 C, so after processing area of the joint exposed. During this technological operation is the removal of residual stresses.
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