Arc welding control method

Patent metadata

Field	Value
Publication number	US-11724329-B2
Application number	US-201816477646-A
Country	US
Kind code	B2
Filing date	Jan 12, 2018
Priority date	Jan 24, 2017
Publication date	Aug 15, 2023
Grant date	Aug 15, 2023

Abstract

An arc welding control method for controlling welding in which a material of a welding wire is aluminum or an aluminum alloy, and a feed speed Fw of the welding wire is alternately switched between a forward feed period and a reverse feed period to repeat a short circuit period and an arc period, a welding current Iw is controlled so that an average value of maximum values of the welding current Iw during the short circuit period is 150 A or less. A reverse feed peak value Wrp during the reverse feed period is set so that an average value of time lengths of the short circuit period is 7 ms or less. Accordingly, the current value can be reduced when the short circuit is released and the lengthening in the short circuit period can be prevented, so that the spatter generation amount can be reduced.

First claim

The invention claimed is:

1. An arc welding control method for controlling a welding in which a material of a welding wire is aluminum or an aluminum alloy, comprising:
alternately switching a feed speed of the welding wire between a forward feed period and a reverse feed period to repeat a short circuit period and an arc period; and
controlling a welding current for the welding so that an average value is 150 A or less, wherein the average value is an average of maximum values of the welding current for each short circuit period.

2. The arc welding control method according to claim 1 , further comprising setting a reverse feed peak value during the reverse feed period so that an average value of time lengths of the short circuit periods is 7 ms or shorter, wherein the average value of time lengths is an average of time lengths of each short circuit period.

3. The arc welding control method according to claim 2 , wherein an absolute value of the reverse feed peak value is set to at least 40 m/minute or more.

4. The arc welding control method according to claim 3 , further comprising detecting an average value of time lengths of the short circuit periods, and performing feedback control on a reverse feed deceleration period so that the average value of the time lengths of the short circuit periods is equal to a predetermined short circuit time setting value.

5. The arc welding control method according to claim 4 , further comprising
controlling the welding current during the short circuit periods to a predetermined initial current value during a predetermined initial period, and thereafter controlling the welding current during the short circuit periods to increase with time, and setting the initial period to 1.5 ms or longer.

6. The arc welding control method according to claim 2 , further comprising detecting an average value of time lengths of the short circuit periods, and performing feedback control on a reverse feed deceleration period so that the average value of the time lengths of the short circuit periods is equal to a predetermined short circuit time setting value.

7. The arc welding control method according to claim 6 , further comprising
controlling the welding current during the short circuit periods to a predetermined initial current value during a predetermined initial period, and thereafter controlling the welding current during the short circuit periods to increase with time, and
setting the initial period to 1.5 ms or longer.

8. The arc welding control method according to claim 2 , further comprising
controlling the welding current during the short circuit periods to a predetermined initial current value during a predetermined initial period, and thereafter controlling the welding current during the short circuit periods to increase with time, and
setting the initial period to 1.5 ms or longer.

9. The arc welding control method according to claim 3 , further comprising
controlling the welding current during the short circuit periods to a predetermined initial current value during a predetermined initial period, and thereafter controlling the welding current during the short circuit periods to increase with time, and
setting the initial period to 1.5 ms or longer.

10. The arc welding control method according to claim 1 , further comprising detecting an average value of time lengths of the short circuit periods, and performing feedback control on a reverse feed peak value during the reverse feed period so that the average value of the time lengths of the short circuit periods is equal to a predetermined short circuit time setting value.

11. The arc welding control method according to claim 10 , further comprising
controlling the welding current during the short circuit periods to a predetermined initial current value during a predetermined initial period, and thereafter controlling the welding current during the short circuit periods to increase with time, and
setting the initial period to 1.5 ms or longer.

12. The arc welding control method according to claim 1 , further comprising detecting an average value of time lengths of the short circuit periods, and performing feedback control on a reverse feed deceleration period so that the average value of the time lengths of the short circuit periods is equal to a predetermined short circuit time setting value.

13. The arc welding control method according to claim 12 , further comprising
controlling the welding current during the short circuit periods to a predetermined initial current value during a predetermined initial period, and thereafter controlling the welding current during the short circuit periods to increase with time, and
setting the initial period to 1.5 ms or longer.

14. The arc welding control method according to claim 1 , further comprising
controlling the welding current during the short circuit periods to a predetermined initial current value during a predetermined initial period, and thereafter controlling the welding current during the short circuit periods to increase with time, and
setting the initial period to 1.5 ms or longer.

Assignees

• Daihen Corp

Inventors

• Ono Kohei
• Nakamata Toshiaki

Classifications

• B23K9/073 Primary

  Stabilising the arc · CPC title

• B23K9/12

  Automatic feeding or moving of electrodes or work for spot or seam welding or cutting · CPC title

• B23K9/095 Primary

  Monitoring or automatic control of welding parameters · CPC title

• B23K9/124

  Circuits or methods for feeding welding wire · CPC title

• B23K9/173

  and of a consumable electrode · CPC title