US 10,919,100 B2Granted

Arc welding control method

AssigneePanasonic Intellectual Property Management Co., Ltd.

InventorsYuya Furuyama, Atsuhiro Kawamoto, Junji Fujiwara, Masaru Kowa, Kaito Matsui

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Abstract

In thin sheet welding, when a heat input amount relative to a sheet thickness is too large, a welding defect such as a deviation from aim due to occurrence of a strain or burn through may easily occur. When a welding current is decreased to reduce the heat input amount, there is an issue in which an arc tends to become unstable. In arc welding that repeats short-circuit and arcing, first heat input period (Th) and second heat input period (Tc) having a heat input amount less than that of first heat input period (Th) are periodically repeated. This reduces the heat input amount into a welding object and suppresses burn through and a strain upon welding while making the arc stable.

Claims8

Dependent claims

An arc welding control method comprising:

performing arc welding by periodically repeating a first heat input period having a first heat input amount and a second heat input period having a second heat input amount to a welding subject using a welding wire that is a consumable electrode,
wherein the first heat input period includes a first short-circuit period and a first arc period and the second heat input period includes a second short-circuit period and a second arc period, and
when release of short-circuit is detected during the second short-circuit period in the second heat input period,
a welding current during the second arc period in the second heat input period is set to be less than a current immediately before the release of the short-circuit, and
the welding current during the second arc period in the second heat input period is set to be less than a welding current during the first arc period in the first heat input period,
or
a total sum of energy indicated by an integral of the welding current over time during the second arc period in the second heat input period is set to be less than a total sum of energy indicated by an integral of the welding current over time during the first arc period in the first heat input period.

4 more elements

An arc welding control method comprising:

performing arc welding by periodically repeating a first heat input period having a first heat input amount and a second heat input period having a second heat input amount to a welding subject using a welding wire that is a consumable electrode,
wherein the first heat input period includes a first short-circuit period and a first arc period and the second heat input period includes a second short-circuit period and a second arc period, and
when release of short-circuit is detected during the second short-circuit period in the second heat input period,
a welding current during the second arc period in the second heat input period is set to be less than a current immediately before the release of the short-circuit, and
is set to be less than a welding current during the first arc period in the first heat input period, so that the welding current during the second arc period in the second heat input period is relatively decreased from the welding current during the first arc period in the first heat input period at a predetermined ratio.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/086,658Filed 17 Mar 2017
Priority: JP 2016-06532229 Mar 2016
Published: US 2019/0070687 A17 Mar 2019
Granted: 16 Feb 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

B23K 9/0953
Monitoring or automatic control of welding parameters: using computing means
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 9/0738
Stabilising the arc: stabilising of the arc by automatic re-ignition means
B23K 9/092
Characterised by the circuits: characterised by the shape of the pulses produced