D&H Sécheron Electrodes Pvt. Ltd manufactures Lotherme - 351. D&H Sécheron Electrodes Pvt. Ltd is an ISO 9001:2000 certified company. The Lotherme - 351 is a low heat input, low hydrogen type electrode suitable for welding carbon steels used in the construction of machinery and equipment subjected to heavy dynamic load, impact and severe service conditions.