Arc welding equipment

Patent metadata

Field	Value
Publication number	US-10160056-B2
Application number	US-201515524029-A
Country	US
Kind code	B2
Filing date	Nov 5, 2015
Priority date	Nov 5, 2014
Publication date	Dec 25, 2018
Grant date	Dec 25, 2018

Abstract

Arc welding equipment for joining the objects at high speed and for reducing the strain of the objects after being joined is provided. The nozzle housing an electrode forming arc plasma is formed from a gas supply part and a gas suction part. The gas supply part has gas supply holes supplying gas outward in a radial direction of the arc plasma. The gas suction part suctions the gas supplied form the gas supply part. A pair of the gas supply holes, which are disposed so that the electrode is disposed therebetween, supply the gas of a first pressure to a position away from the electrode by a first distance. A pair of the gas supply holes, which are disposed so that the electrode is disposed therebetween other than the pair of the gas supply holes, supply the gas of a second pressure to a position away from the electrode by a second distance. The second distance is longer than the first distance. The gas of the second pressure is lower than that of the first pressure. Thereby, the arc plasma is compressed in a direction connecting the gas supply holes, and the arc plasma becomes long in a direction connecting the gas supply holes.

First claim

What is claimed is:

1. A welding equipment for arc welding two objects to be joined comprising:
an electrode disposed in a vicinity of a part where the two objects contact, an arc plasma being formed between the electrode and the part where the two objects contact;
a gas supply part disposed radially outside of the electrode, the gas supply part having a plurality of gas supply holes which supply gas to outside in a radial direction of the arc plasma;
a gas suction part disposed between the gas supply part and the electrode, the gas suction part having a gas suction hole suctioning the gas supplied to outside in the radial direction of the arc plasma using the gas supply part;
a power supply part which is electrically connected with the electrode, the power supply part supplying electric power to the electrode, polarities of the electric power differ from those of the two objects; and
a gas storage part that stores gas supplied from the gas supply part to outside in the radial direction of the arc plasma,
wherein a pair of the gas supply holes are mounted so that the electrode is disposed therebetween, the pair of the gas supply holes being formed at a position away from the electrode by a first distance,
wherein a pair of the gas supply holes are disposed so that the electrode is disposed therebetween other than the other pair of the gas supply holes, the pair of the gas supply holes being formed at a position away from the electrode by a second distance that is longer than the first distance,
wherein the pair of the gas supply holes supply the gas of a first pressure outward in the radial direction of the arc plasma, apart from one pair of the gas supply holes, another pair of the gas supply holes are provided so as to sandwich the electrode, the pair of the gas supply holes supply the gas of a second pressure outward in the radial direction of the arc plasma, the second pressure being lower than the first pressure.

2. The welding equipment as set forth in claim 1 , wherein a line connecting the pair of the gas supply holes via a point on a center axis of the electrode is a first virtual line;
a line connecting the pair of the gas supply holes via the point on the center axis of the electrode so that the electrode is disposed between the pair of the gas supply holes other than the pair of the gas supply holes is a second virtual line;
the first virtual line orthogonally crosses the second virtual line at the center axis of the electrode; and
a cross-section shape of the arc plasma perpendicular to the center axis of the electrode has an elliptic shape, the elliptic shape having a long side on the second virtual line.

3. The welding equipment as set forth in claim 1 , wherein the welding equipment further includes an electrode housing part which has a housing space that houses the electrode inside in a radial direction of the gas suction part; and
the gas flows toward the arc plasma in the housing space.

4. The welding equipment as set forth in claim 1 , wherein the welding equipment further includes an urging means for urging the gas supply part and the gas suction part in a direction toward the two objects;
when the gas supply part supplies the gas having a prescribed pressure level or more outward in the radial direction of the arc plasma;
a gap being formed between an end face and another end face; and
the end face of the gas supply part is disposed at a side of the two objects, the other end face of the two objects being disposed at a side of the gas supply part.

5. The welding equipment as set forth in claim 1 , wherein the pair of the gas supply holes become closer to the electrode as they reach toward the two objects.

Assignees

• Denso Corp

Inventors

• Shirai Hideaki
• Hayakawa Tsuyoshi
• Kataoka Yuusuke

Classifications

• B23K9/167

  and of a non-consumable electrode · CPC title

• B23K37/0235

  the guide member forming part of a portal · CPC title

• B23K10/006

  Control circuits therefor · CPC title

• B23K9/1006

  Power supply · CPC title

• B23K9/324

  Devices for supplying or evacuating a shielding or a welding powder, e.g. a magnetic powder · CPC title