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.