Arc welding method comprising a consumable welding wire

Patent metadata

Field	Value
Publication number	US-2021237191-A1
Application number	US-201917051973-A
Country	US
Kind code	A1
Filing date	Jul 26, 2019
Priority date	Jul 27, 2018
Publication date	Aug 5, 2021
Grant date	—

Abstract

The invention relates to an arc welding method using a consumable welding wire (1), wherein in successive welding cycles (SZ) during a welding process (Pi) a certain welding current (I(t)) is applied to the welding wire (1) and the welding wire is moved with a certain wire conveying speed (v(t)) towards a workpiece (2) to be processed. The aim of the invention is to further improve the stability of the welding method. The aim is achieved, according to the invention, in that in the event of a change of the welding process (P1) to a welding process (P2) with an increased mean wire conveying speed (vmean) during a welding cycle (SZ) and/or with an increased mean welding current (Imean) during a welding cycle (SZ), a lowering phase (AP) is initiated, wherein in the lowering phase (AP) the welding current (IA(t)) is lowered for a specified duration (ΔtA).

First claim

1 - 13 . (canceled)

14 . An arc welding method using a consumable welding wire ( 1 ), wherein in successive welding cycles (SZ) during a welding process (P i ) a certain welding current (I(t)) is applied to the welding wire ( 1 ) and the welding wire is moved with a certain wire conveying speed (v(t)) towards a workpiece ( 2 ) to be processed, wherein
when the welding process (P 1 ), in particular a short-circuit-based welding process, is changed to a welding process (P 2 ) with an increased mean wire conveying speed (v mean ) during a welding cycle (SZ) and/or with an increased mean welding current (I mean ) during a welding cycle (SZ), in particular a pulsed welding process, a lowering phase (AP) is initiated, wherein in the lowering phase (AP) the welding current (I A (t)) is lowered for a specified duration (Δt A ), by the mean welding current (I mean,A ) in the lowering phase (AP) being reduced by 10% to 50% compared to the previous mean welding current (I mean ) during a welding cycle (SZ).

15 . The arc welding method according to claim 14 , wherein-the lowering phase (AP) is initiated after a specified delay time (t d ) has elapsed.

16 . The arc welding method according to claim 14 , wherein
the welding current (I A (t)) in the lowering phase (AP) is reduced to a constant welding current value (I mean,A ) for the specified duration (Δt A ).

17 . The arc welding method according to claim 14 , wherein the welding current (I A (t)) in the lowering phase (AP) is reduced according to a specified function for the specified duration (Δt A ).

18 . The arc welding method according to claim 14 , wherein the duration (Δt A ) of the lowering phase (AP), the welding current (I A (t)) in the lowering phase (AP) and/or the specified delay time (t d ) are specified depending on the welding wire ( 1 ) used.

19 . The arc welding method according to claim 14 , wherein the duration (Δt A ) of the lowering phase (AP) is one to 30 welding cycles (SZ).

20 . The arc welding method according to any claim 15 , wherein the specified delay time (t d ) is set such that the welding wire ( 1 ) is moved towards the workpiece ( 2 ) by 5 mm to 25 mm during the delay time (t d ).

21 . The arc welding method according to any claim 14 , wherein the free length (l so ) of the welding wire ( 1 ) is determined indirectly and the duration (Δt A ) of the lowering phase (AP), the mean welding current (I A (t)) in the lowering phase (AP) and/or the delay time (t d ) are modified depending on the determined free length (l so ) of the welding wire ( 1 ).

22 . The arc welding method according to claim 21 , wherein the free welding wire length (l so ) is determined indirectly by a measurement of the welding voltage (U(t)), the welding current (I(t)) between the welding wire ( 1 ) and the workpiece ( 2 ), and the wire conveying speed (v(t)).

23 . The arc welding method according to claim 21 , wherein during a welding cycle (SZ), one pulsed-arc phase (LB) with at least one pulse-shaped welding current (I(t)) and one short-arc phase with one or more alternating short circuits between the welding wire ( 1 ) and the workpiece ( 2 ) and arc phases occur consecutively.

24 . The arc welding method according to claim 23 , wherein the free welding wire length (l so ) in the short-arc phase is determined by means of a resistance measurement during a short-circuit between the welding wire ( 1 ) and the workpiece ( 2 ).

25 . The arc welding method according to claim 14 , wherein in the event of a further change in the welding process (P 1 ) to a welding process (P 2 ) with an increased mean wire conveying speed (v mean ) during a welding cycle (SZ) and/or an increased mean welding current (I mean ) during a welding cycle (SZ), the duration (Δt A ) of the lowering phase (AP) is corrected with regard to the specified duration (Δt A ).

Assignees

• Fronius Int Gmbh

Inventors

• Soellinger Dominik
• Artelsmair Josef
• Mayer Manuel

Classifications

• B23K9/173 Primary

  and of a consumable electrode · CPC title

• B23K9/092

  characterised by the shape of the pulses produced · CPC title

• B23K9/124

  Circuits or methods for feeding welding wire · CPC title

• B23K9/093

  the frequency of the pulses produced being modulable · CPC title

• B23K9/095

  Monitoring or automatic control of welding parameters · CPC title