US 12,005,530 B2Granted

AC pulse arc welding control method

AssigneeDAIHEN Corporation

InventorsKento Takada, Wakana Kondo

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Abstract

To stabilize a growth state of a droplet during an electrode negative polarity peak period in consumable electrode AC pulse arc welding. In an AC pulse arc welding control method for controlling welding which is performed by feeding a welding wire, and applying an electrode negative polarity base current during an electrode negative polarity base period, then applying an electrode negative polarity peak current during an electrode negative polarity peak period, and then applying an electrode positive polarity current during an electrode positive polarity period, to repeatedly apply these welding currents, the electrode negative polarity peak period includes a rising period Tu, a peak period Ta, and a falling period Td, a time ratio of the peak period Ta to the electrode negative polarity peak period is less than 20%, and the falling period Td is a period twice or more longer than the rising period Tu.

Claims18

Dependent claims

An AC pulse arc welding control method for controlling welding comprising:

feeding a welding wire, and
applying repeatedly welding currents in accordance with a welding current waveform, one cycle of which includes an electrode negative polarity base current during an electrode negative polarity base period, an electrode negative polarity peak period current during an electrode negative polarity peak period, and an electrode positive polarity current during an electrode positive polarity period, to repeatedly apply these welding currents to repeatedly attain a transfer of droplets,
wherein
the electrode negative polarity base current, the electrode negative polarity peak period current and the electrode positive polarity current are applied continuously in this order,
the electrode negative polarity peak period (Tpn) comprises a rising period (Tu), a peak period (Ta) and a falling period (Td), wherein Tpn=Tu+Ta+Td, and
a time ratio (Ta/Tpn) of the peak period (Ta) to the electrode negative polarity peak period (Tpn) is set so that (Ta/Tpn)×100 is greater than zero and less than 20%, and
wherein the transfer of droplets occurs once per each cycle of the welding current waveform.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/338,887Filed 17 Oct 2017
Priority: JP 2016-20795824 Oct 2016
Published: US 2020/0055135 A120 Feb 2020
Granted: 11 Jun 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

B23K 9/092
Characterised by the circuits: characterised by the shape of the pulses produced
B23K 9/095
Arc welding or cutting: monitoring or automatic control of welding parameters
B23K 9/073
Arrangements or circuits for starting the arc, e.g. by generating ignition voltage, or for stabilising the arc: stabilising the arc
B23K 9/0732
Stabilising the arc: stabilising of the arc current

Family

US 2020/0055135 A1Pre-grant publication · published 20 Feb 2020
US 12,005,530 B2This patent

From the US filing history. Foreign family members aren’t listed.

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