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Peculiarities of welding process

Carbon tool steels belong to the materials of reduced weldability. The reason is the technology of melting such steel - in induction or arc electric furnaces. As a consequence, the percentage of carbon in such steel is increased, and the metal itself has a fairly high sensitivity to any overheating, which further complicates the welding process. In addition, the oxygen content of the alloy has a negative effect on brittleness. Two methods of welding are used to reduce this effect - friction welding and contact electric welding.

Preheating

All of these processes have in common that the steel is heated immediately before joining. The preheating temperature is determined by the percentage of carbon in the steel - the lower the percentage, the lower the temperature can be. Usually the preheating temperature is 350...400°С. After welding low annealing is necessary: up to 160 ... 180°С, after which the residual stresses are removed and the warpage of the welded products decreases. Evek GmbH offers to buy carbon tool steel at affordable price in wide range. We provide delivery of products anywhere in the continent. Price is optimal.

Technical characteristics of friction welding

In friction welding, the connection occurs due to the heat that is released at the interface between the parts to be welded. While friction welding uses the mechanical energy of friction between parts that rotate in different directions and are simultaneously compressed by an axial force, contact electric welding heats up due to the thermal effect of the electric current flowing through the welding area. Friction welding of carbon steel tool alloys has the following advantages:

1. Sufficiently high productivity;
2. Stable quality of the formed connection;
3. Increased efficiency of the process.

Energy intensity .

During contact electric welding of tool carbon steels the specific energy to be applied to the joints ranges from 18 ... 20 ^W/mm2 (for steels containing 0,7 ... 0,9% carbon) to 130 ... 150 ^W/mm2 - for tool steels containing 1.2...1,3 % of carbon (specific power consumption of the process also increases with the increase of the area of the joint). After joining, the parts are still under the influence of the axial compressive force for some time during their cooling.

Tempering .

During welding temperatures of up to 1000 ... 1100°С develop in the connection area, so after the processing the seam area is tempered. During this technological operation is the removal of residual stresses.

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