Welmech Engineering Company [Pvt.] Ltd. Offers Sealed Quench Furnace for Carburizing. Welmech Engineering Company Pvt. Ltd. Is an ISO 9001 certified company. This high capacity heat treatment furnace has reliable controls and offers easy maintenance. This machine has energy saving attributes and involves low operating cost. Sealed Quench Furnace for Carburizing is fully automated through PLC control with report generation. It is used in carbo-nitriding, bright annealing, re-carburizing, tempering, etc.