JPH0160777U

JPH0160777U -

Info

Publication number: JPH0160777U
Application number: JP15478087U
Authority: JP
Priority date: 1987-10-09
Filing date: 1987-10-09
Publication date: 1989-04-18

Description

[Brief explanation of the drawing]

第１図はこの考案の一実施例による消耗電極式
溶接機のアークスタート回路を示すブロツク図、
第２図はこの回路による動作シーケンス図、第３
図は従来の消耗電極式溶接機のアークスタート回
路を示すブロツク図、第４図はこの回路による動
作シーケンス図である。図において、１は本電圧設定器、２はスタート
電圧設定器、３は条件切換器、５はタイマー回路
、１１は短絡検出器、１２はアナログスイツチ、
１３は第２スタート電圧設定器、１４は電圧加算
器である。なお、図中、同一符号は同一、または
相当部分を示す。 FIG. 1 is a block diagram showing an arc start circuit of a consumable electrode welding machine according to an embodiment of this invention.
Figure 2 is an operation sequence diagram of this circuit, and Figure 3 is an operation sequence diagram of this circuit.
The figure is a block diagram showing an arc start circuit of a conventional consumable electrode type welding machine, and FIG. 4 is an operation sequence diagram of this circuit. In the figure, 1 is a main voltage setting device, 2 is a start voltage setting device, 3 is a condition switch, 5 is a timer circuit, 11 is a short circuit detector, 12 is an analog switch,
13 is a second start voltage setter, and 14 is a voltage adder. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims

[Scope of utility model registration request]

In the arc start circuit of a consumable electrode welding machine, which has a start voltage setting device and a timer circuit to set a welding voltage different from the actual welding voltage for a certain period of time when starting the arc, the consumable electrode and the A short circuit detector that detects a short circuit with the workpiece, an analog switch that uses the output of this short circuit detector as a gate input, a second start voltage setter connected to the input part of this analog switch, and a a voltage adder into which the output and the output of the second start voltage setter are input;
A condition switch is provided to which the voltage setting value for the main welding and the voltage output value of the voltage adder are input, and the voltage setting value and the voltage output value are switched by the output command of the timer circuit, and the welding voltage is When the welding current starts flowing after inputting it to the output circuit and starting welding,
During the fixed time period set by the above timer circuit,
If the welding voltage set by the start voltage setting device is output, and a short circuit between the consumable electrode and the workpiece occurs during that time, immediately add the second start voltage setting device output to the above start voltage setting device output, and An arc start circuit for a consumable electrode welding machine, characterized in that it is configured to output a welding voltage based on the added value.