Patent ID: 6043448
Filing Date: 2000-03-28
Classification: B23K

Abstract:
A method of welding cylindrical bodies characterized by:forming, by on/off switching control, welding current waveforms with two peaks having, within a half cycle (1/2f) of welding current, a first rising straight line (A) rising up to a specified rising current set value (S.sub.1), a first pause straight line (B) extending from its upper end (A), a first drop straight line (C) dropping from its rear end (B) to a specified current drop set value (S.sub.2), a first drop pause straight line (D) extending from its lower end (C), a second rising straight line (A.sub.1) rising from its rear end (D) to the current set value (S.sub.1), and a second pause straight line (B.sub.1) extending from its upper end (A.sub.1),setting the duration (t.sub.1), (t.sub.2) of the first and second pause straight lines (B), (B.sub.1) of the welding current waveforms at the same value,setting the duration (t.sub.3) of the first drop pause straight line (D) at a multiple of 1 or more of the set duration (t.sub.1), (t.sub.2) of the pause straight lines (B), (B.sub.1), andadjusting the drop rate from the rising current set value (S.sub.1) to the current drop set value (S.sub.2) so that the duration (T.sub.1-1) from the start of the first rising straight line (A) till the end of the first pause straight line (B) and the duration (T.sub.1-2) from the start of the first drop straight line (C) till the end of the second pause straight line (B.sub.1) may be in the relation of T.sub.1-2 =T.sub.1-1 .+-.T.sub.1-1 .times.(0 to 15%).