and dimentional stability.
Cold work tool steels are normally used at room temperatures featuring good wear resistance, toughness
and dimentional stability.
and dimentional stability.
Repair Welding for plastic Mould Steels
General
| * | Clean the welding area carefully; remove oil, rust, dirt etc., |
| * | Remove layers of chrome plating/ nitriding/ case hardening-if any. |
| * | Flux to detect any possible cracks. |
| * | Avoid sharp edges. |
| * | Use thin electrode and filler rods, dia. 1.6-2.4mm, use DC with positive polarity,weld under TIG, argon gas flow 6-10I/min., depending on nozzle dia, which is 8-10mm dia., 70-150Amp for 1.6mm dia rod and 100-250Amp. For 2.4mm dia, 15-17V. |
| * | Welding and filler rod material analysis as near to analysis as work piece as possible. |
| * | Manipulate electrode once a pool of molten metal of sufficient volume has formed. |
| * | If molten metal should build up at electrode end, regrind tip to a sharper end. |
| * | After the welding is finished, repeat the original tempering. |
Specific:
Welding
of annealed pieces:
| * | Warm up thoroughly to min. 350 degrees Celsius, re heat once the temperature drops to 300 degrees. |
| * | Cool the workpiece down to 100 degrees Celsius in furnace or under insulating blankets. |
| * | Temper at temperature of 20 degree Celsius below the standard for the steel grade in question. |
Welding of H & T work pieces:
| * | Take care to avoid crack formation. |
| * | Repair only smaller areas of damages. |
| * | Warm up thoroughly to original tempering temperature (min 250 degrees Celsius). |
| * | Weld at this temperature and reheat if temperature drops below 200 degrees Celsius. |
| * | Hammer the welding beads slightly to reduce shrinkage stresses. |
| * | After welding reheat again to min. 250 degrees Celsius, for every 25mm wall thickness, soak for one hour, then air cool down to 80 degrees Celsius. |
| * | Temper again. |
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