THERMIT WELDING METHOD Russian patent published in 2006 - IPC B23K23/00 

FIELD: welding-on members of less refractory metal to members of more refractory metals, namely manufacturing process for welding electrochemical protection members of main pipelines.

SUBSTANCE: welding chamber of material with high melting point has ducts for gas discharge and ducts for thermit slag discharge. Welded-on end of first member is inserted through opening in wall of welding chamber and it is fixed in heat removal tube formed of metal having melting point higher than that of metal of first member. Heat removal tube is arranged on surface of second metallic member made of more refractory metal than metal of first member. Method is realized at using thermit mixture in the form of molded cylindrical rod with envelope. At welding process heat removal tube is slightly melted for securing first member to its inner surface and for welding tube itself to surface of second member.

EFFECT: enhanced quality, improved operational reliability of welded joint.

2 cl, 1 dwg, 1 ex