PREPARATION OF PIPE OR SHEET EDGES WITH PLATING LAYER FOR BUTT WELDING (VERSIONS) Russian patent published in 2014 - IPC B23K33/00 B23K9/167 

FIELD: metallurgy.

SUBSTANCE: this method comprises machining of edges to make the skews over pipe or sheet with 2-3 mm circular transition to plating layer and nose from plating layer in the form of rectangular ledge. Skew of edges over pipe or sheets to nose is broken at angles of 1-2 and 4-8 degrees. Nose from plating layer is 2.5-3.5 mm high and 3.4-4.7 mm long. In compliance with second version, method comprises machining of edges to produce skew with nose over pipe or sheet and bore with skew on plating layer side to depth larger than thickness of the latter. Skew of edges over pipe or sheet to nose features angle of 1-2 degrees. Nose is shaped to rectangular ledge and is 1.8-2.3 mm high and 3.2-5.2 mm long while bore features skew angle of 52-57 degrees.

EFFECT: lower material input, simplified design of welding set, higher quality of weld.

3 cl, 2 dwg