Multiple welding method

Patent metadata

Field	Value
Publication number	US-12145227-B2
Application number	US-202017602338-A
Country	US
Kind code	B2
Filing date	Apr 7, 2020
Priority date	Apr 10, 2019
Publication date	Nov 19, 2024
Grant date	Nov 19, 2024

Abstract

A a multiple welding method having an improved starting process in which the control unit of the guide electrode starts welding-wire advancing of the guide electrode and sends a synchronization signal to the control unit of the trailing electrode when the guide electrode has moved a certain distance or for a certain time. The control unit of the trailing electrode starts welding-wire advancing of the trailing electrode in dependence on the received synchronization signal before the guide electrode touches the workpiece.

First claim

The invention claimed is:

1. A method for carrying out a multiple welding process in which a welding process is carried out in each case with at least two welding wires as consumable electrodes on a workpiece, a first welding wire being provided as a guide electrode and the at least one other welding wire being provided as a trailing electrode, the welding processes of the guide electrode and the trailing electrode each being controlled by a control unit, wherein a starting process of the multiple welding method is carried out in that the control unit of the guide electrode starts welding-wire advancing of the guide electrode and sends a synchronization signal to the control unit of the trailing electrode when the guide electrode has moved a certain distance or for a certain time and in that the control unit of the trailing electrode starts welding-wire advancing of the trailing electrode in dependence on the received synchronization signal before the guide electrode touches the workpiece.

2. The method according to claim 1 , wherein the guide electrode touches the workpiece before the trailing electrode, an arc being ignited on the guide electrode when the workpiece is touched and an arc being ignited on the trailing electrode when the trailing electrode touches the workpiece or penetrates a region surrounding the guide electrode, which region is ionized by the arc of the guide electrode.

3. The method according to claim 1 , wherein the trailing electrode touches the workpiece before the guide electrode, the control unit of the trailing electrode detecting a short circuit and sending a synchronization signal to the control unit of the guide electrode, the control unit of the guide electrode stopping welding-wire advancing of the guide electrode and the control unit of the trailing electrode stopping welding-wire advancing of the trailing electrode, wherein the control unit of the trailing electrode moves the trailing electrode to a certain electrode distance away from the workpiece and sends a synchronization signal to the control unit of the guide electrode, wherein the control unit of the guide electrode starts welding-wire advancing of the guide electrode and an arc is ignited on the guide electrode when the guide electrode touches the workpiece, the control unit of the guide electrode sending a synchronization signal to the control unit of the trailing electrode when the arc is ignited, and wherein the control unit of the trailing electrode starts welding-wire advancing of the trailing electrode in dependence on the received synchronization signal, an arc being ignited on the trailing electrode when the trailing electrode touches the workpiece or penetrates a surrounding region that is ionized by the arc of the guide electrode.

4. The method according to claim 1 , wherein the trailing electrode touches the workpiece before the guide electrode, wherein the trailing electrode is defined as the guide electrode and the guide electrode is defined as the trailing electrode, wherein an arc is ignited on the guide electrode when the workpiece is touched and an arc is ignited on the trailing electrode when the trailing electrode touches the workpiece or penetrates a surrounding region that is ionized by the arc of the guide electrode.

5. The method according to claim 2 , wherein the control unit of the guide electrode sends a synchronization signal to the control unit of the trailing electrode when the arc of the guide electrode is ignited, wherein the control unit of the trailing electrode stops welding-wire advancing when the synchronization signal is received and the trailing electrode is held in a waiting position for a certain waiting time and the control unit of the trailing electrode starts welding-wire advancing of the trailing electrode after the waiting time, the arc being ignited on the trailing electrode when the trailing electrode touches the workpiece or penetrates the region surrounding the guide electrode, which region is ionized by the arc of the guide electrode.

6. The method according to claim 1 , wherein a pulse welding process, a welding process having reversing welding-wire advancing, a corona arc welding process or a short arc welding process is carried out as the welding process of the guide electrode and/or the trailing electrode.

7. The method according to claim 1 , wherein the guide electrode and the trailing electrode are fed to a common weld pool on the workpiece.

8. The method according to claim 1 , wherein a common control unit is provided for the control unit of the guide electrode and the control unit of the trailing electrode, which common control unit controls the welding process on the guide electrode and the welding process on the trailing electrode.

9. A welding arrangement for carrying out a multiple welding method on a workpiece having at least two welding devices for carrying out mutually independent welding processes, each welding device having a welding wire as a consumable electrode, a welding-wire advancing unit and a control unit for controlling the respective welding process, a welding wire being provided as a guide electrode and the at least one remaining welding wire being provided as a trailing electrode, wherein for performing a starting process of the multiple welding process, the control unit of the guide electrode is configured to control the welding-wire advancing unit of the welding device of the guide electrode in order to start welding-wire advancing of the guide electrode and to send a synchronization signal to the control unit of the trailing electrode when the guide electrode moves a specified distance or for a specified time and wherein the control unit of the trailing electrode is configured to control the welding-wire advancing unit of the welding device of the trailing electrode in order to start welding-wire advancing of the trailing electrode in dependence on the received synchronization signal before the guide electrode touches the workpiece.

10. The welding arrangement according to claim 9 , wherein the control unit of the guide electrode is configured to ignite an arc at the guide electrode when the guide electrode touches the workpiece before the trailing electrode and wherein the control unit of the trailing electrode is configured to ignite an arc at the trailing electrode when the trailing electrode touches the workpiece or penetrates a surrounding region of the guide electrode, which region is ionized by the arc of the guide electrode.

11. The welding arrangement according to claim 9 , wherein the control unit of the trailing electrode is configured to detect a short circuit and to send a synchronization signal to the control unit of the guide electrode when the trailing electrode touches the workpiece before the guide electrode, the control unit of the guide electrode being configured to control the welding-wire advancing unit of the welding device of the guide electrode when the synchronization signal is received in order to stop welding-wire advancing of the guide electrode and the control unit of the trailing electrode being provided to control the welding-wire advancing unit of the welding device of the trailing electrode in order to stop welding-wire advancing of the trailing electrode, wherein the control unit of the trailing electrode is configured to control the welding-wire advancing unit of the welding device of the trailing electrode in order to move the trailing electrode a certain electrode distance away from the workpiece and to send a synchronization signal to the control unit of the guide electrode, in that wherein the control unit of the guide electrode is configured to control the welding-wire advancing unit of the welding device of the guid

Assignees

• Fronius Int Gmbh

Inventors

• Söllinger Dominik
• Waldhör Andreas

Classifications

• B23K9/125

  Feeding of electrodes (for stabilising arc B23K9/073) · CPC title

• B23K9/1012

  characterised by parts of the process · CPC title

• B23K9/0953

  using computing means · CPC title

• B23K9/1735 Primary

  making use of several electrodes · CPC title

• B23K9/124

  Circuits or methods for feeding welding wire · CPC title