JP4092802B2

JP4092802B2 - Welding voltage control method and consumable electrode arc welding power source

Info

Publication number: JP4092802B2
Application number: JP36890298A
Authority: JP
Inventors: 紀典本宮; 英俊大山; 朗子植田; 茂樹米森
Original assignee: Panasonic Corp; Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Corp; Panasonic Holdings Corp
Priority date: 1998-12-25
Filing date: 1998-12-25
Publication date: 2008-05-28
Anticipated expiration: 2018-12-25
Also published as: JP2000190075A

Description

【０００１】
【発明の属する技術分野】
本発明は、消耗電極と母材との間に印加する溶接出力電圧の極性を逆極性と正極性とに交互に繰り返し切り換え溶接を行う消耗電極式アーク溶接における溶接電圧制御方法および消耗電極式アーク溶接電源に関する。
【０００２】
【従来の技術】
近年、消耗電極と母材との間に印加する電圧を逆極性と正極性とで交互に繰り返し切り換える消耗電極式アーク溶接電源は、溶接電圧は溶接電流指令値のみに対応した一元化電圧指令値で溶接電圧を制御している。
【０００３】
以下、従来の溶接電圧制御方法および消耗電極式アーク溶接電源について図面を参照しながら説明する。
【０００４】
図４は従来の消耗電極式アーク溶接電源の構成を示すブロック図である。図４において、１は入力交流電源、２は溶接出力部、３は第１スイッチング素子、４は第２スイッチング素子、５および６は出力端子、７は溶接出力制御部、８は溶接電流検出部、９は溶接電圧検出部、１０は溶接電流設定部、１１は溶接電圧微調整設定部、１２は極性比率設定部、１３は極性切換制御部、１４は溶接電圧一元化演算部である。
【０００５】
上記構成においてその動作を説明する。まず、溶接電流設定部１０は設定された所定の電流値に応じた出力信号を出力する。また、極性比率設定部１２は設定された所定の逆極性と正極性の比率に応じた出力信号を出力する。つぎに、溶接電圧一元化演算部１４は、溶接電流設定部１０の出力信号と溶接電圧微調整設定部１１の出力信号を入力して、溶接電流設定部１０で設定した所定の電流値に対応した溶接電圧指令値を決定するとともに、溶接電圧微調整設定部で設定した所定の補正値を溶接電圧指令値より加減算し決定した一元化電圧指令値を出力する。また、溶接電流検出部８は溶接出力電流を検出し、溶接電圧検出部９は、溶接出力電圧を検出する。
【０００６】
極性切換制御部１３は、極性比率設定部１２の出力信号を入力し、極性比率設定部１２の出力信号が逆極性を指令している場合には、第１スイッチング素子３をオン，第２スイッチング素子４をオフとし、溶接出力部２の出力する電圧を出力端子５と出力端子６との間に逆極性で供給し、また、極性比率設定部１２の出力信号が正極性を指令している場合には、第１スイッチング素子３をオフ，第２スイッチング素子４をオンとし、溶接出力部２が出力する電圧を出力端子５と出力端子６との間に正極性で供給する。
【０００７】
溶接出力制御部７は、溶接電流検出部８の出力信号と溶接電圧検出部９の出力信号と溶接電流設定部１０の出力信号と溶接電圧一元化演算部１４の出力信号とを入力し、溶接出力電流と設定電流または出力電圧と設定電圧が一致するように溶接出力部２を制御し溶接制御を行っている。
【０００８】
【発明が解決しようとする課題】
このような従来の溶接電圧制御方法および消耗電極式アーク溶接電源では、極性比率に応じて適正な溶接電圧が異なるため、極性比率の設定によって溶接電圧の再調整をする必要があり、また、その調整量は溶接電流指令値やシールドガスの種類や消耗電極の種類などにより異なっており、溶接条件調整が困難であるという問題点があった。
【０００９】
本発明は上記の課題を解決するもので、所定の極性比率に対応して溶接電流指令値の補正を行うことのできる溶接電圧制御方法および消耗電極式アーク溶接電源を提供することを目的とする。
【００１０】
【課題を解決するための手段】
請求項１に係わる本発明は、消耗電極と母材との間に印加する溶接出力電圧の極性を逆極性と正極性とに交互に繰り返し切り換える消耗電極式アーク溶接電源において、溶接電流設定部で設定した所定の溶接電流に応じた溶接電圧指令値を決定し、溶接電圧微調整設定部で設定した前記溶接電圧指令値を補正するための所定の第１の補正値と極性比率設定部で設定した所定の極性の比率に応じた前記溶接電圧指令値を補正するための第２の補正値を前記溶接電圧指令値より加減算して溶接電圧指令値を決定するようにした溶接電圧制御方法である。
【００１１】
本発明により、設定した極性比率に応じて溶接電圧指令値が補正され、溶接条件の調整、特に溶接電圧調整の作業性を改善することができる。
【００１２】
請求項２に係わる本発明は、消耗電極と母材との間に印加する溶接出力の極性を逆極性と正極性とに交互に繰り返し切り換える消耗電極式アーク溶接電源において、溶接電流設定部と、溶接電圧微調整設定部と、逆極性と正極性との所定の比率を設定する極性比率設定部と、前記極性比率設定部の出力信号を入力して極性の切り換えを制御する極性切換制御部と、前記溶接出力の電流を検出する溶接電流検出部と、前記溶接出力の電圧を検出する溶接電圧検出部と、前記溶接電流設定部の出力信号と前記溶接電圧微調整設定部の出力信号と前記極性比率設定部の出力信号を入力して溶接電圧指令値を決定する溶接電圧一元化演算部と、前記溶接電流設定部の出力信号と前記溶接電圧一元化演算部の出力信号と前記溶接電流検出部の出力信号と前記溶接電圧検出部の出力信号を入力して前記溶接出力の出力を制御する溶接出力制御部とを備え、前記溶接電圧一元化演算部は前記溶接電流設定部で設定した所定の溶接電流に応じた溶接電圧指令値を決定するとともに、前記溶接電圧微調整設定部で設定した前記溶接電圧指令値を補正するための所定の第１の補正値と前記極性比率設定部で設定した所定の極性比率に応じた前記溶接電圧指令値を補正するための第２の補正値を前記溶接電圧指令値より加減算し決定するようにした消耗電極式アーク溶接電源である。
【００１３】
本発明により、請求項１に係わる本発明と同じ作用と効果を得ることができる。
【００１４】
請求項３に係わる本発明は、前記第２の補正値が、溶接電流指令値により決定されるようにした溶接電圧制御方法および消耗電極式アーク溶接電源である。
【００１５】
本発明により、請求項１に係わる本発明と同じ作用と効果を得ることができる。
【００１６】
請求項４に係わる本発明は、前記第２の補正値が、シールドガスの種類，消耗電極の径により決定されるようにした請求項１ないし請求項２のいづれかに記載の溶接電圧制御方法および消耗電極式アーク溶接電源である。
【００１７】
本発明により、請求項１に係わる本発明と同じ作用と効果を得ることができる。
【００１８】
請求項５に係わる本発明は、前記第２の補正値が、溶接電流指令値，シールドガスの種類，消耗電極の種類により決定されるようにした請求項１ないし請求項２記載の溶接電圧制御方法および消耗電極式アーク溶接電源である。
【００１９】
本発明により、請求項１に係わる本発明と同じ作用と効果を得ることができる。
【００２０】
【発明の実施の形態】
（実施の形態１）
以下、本発明の溶接電圧制御方法および消耗電極式アーク溶接電源の実施の形態１について図面を参照しながら説明する。本発明は請求項１および請求項２に係わる。
【００２１】
図１は本実施の形態の構成を示すブロック図である。なお、図４に示した従来例と同じ構成要素には同一番号を付与して詳細な説明を省略する。本実施の形態が従来例と異なる点は、溶接電圧一元化演算部が溶接電流設定部１０の出力信号と溶接電圧微調整部１１の出力信号と極性比率設定部１２の出力信号とを入力し、極性比率に応じて溶接設定指令値を補正するようにしたことにある。
【００２２】
上記構成においてその動作を説明する。まず、溶接電流設定部１０は、設定された所定の電流値に応じた出力信号を出力する。また、溶接電圧微調整設定部１１は、設定された所定の微調整値に応じた出力信号を出力する。さらに、極性比率設定部１２は、設定された所定の逆極性と正極性の比率に応じた出力信号を出力する。
【００２３】
つぎに、溶接電圧一元化演算部１４は、溶接電流設定部１０の出力信号と溶接電圧微調整設定部１１の出力信号と極性比率設定部１２の出力信号とを入力して、溶接電流設定部１０で設定した所定の溶接電流に対応した溶接電圧指令値を決定するとともに、溶接電圧微調整設定部１１で設定した所定の第１の補正値と前記極性比率設定部１２で設定した所定の極性の比率に応じた第２の補正値を前記溶接電圧指令値より加減算し決定した一元化電圧指令値を出力する。さらに、溶接電流検出部８は溶接出力電流を検出し、溶接電圧検出部９は、溶接出力電圧を検出する。
【００２４】
極性切換制御部１３は、極性比率設定部１２の出力信号を入力し、極性比率設定部１２の出力信号が逆極性を指令している場合には、第１スイッチング素子３をオン，第２スイッチング素子４をオフとし、溶接出力部２の出力する電圧を出力端子５と出力端子６との間に逆極性で供給し、また、極性比率設定部１２の出力信号が正極性を指令している場合には、第１スイッチング素子３をオフ，第２スイッチング素子４をオンとし、溶接出力部２が出力する電圧を出力端子５と出力端子６との間に正極性で供給する。
【００２５】
溶接出力制御部７は、溶接電流検出部８の出力信号と溶接電圧検出部９の出力信号と溶接電流設定部１０の出力信号と溶接電圧一元化演算部１４の出力信号とを入力し、溶接出力電流と設定電流または溶接出力電圧と設定電圧が一致するように溶接出力部２を制御し溶接電圧制御を行っている。
【００２６】
ここで、溶接出力制御部７は、消耗電極と母材との間で接触短絡とアークとを周期的に繰り返しながら溶接が進行するショートアーク溶接と、溶接電流にパルス電流を周期的に重畳させ溶接が進行しするパルスアーク溶接とではアーク発生期間中の制御内容が異なっており、ショートアーク溶接の場合は、溶接電圧検出部９の出力信号または溶接電圧検出部９の出力信号を平均化した平均値と溶接電圧一元化演算部１４の出力信号とが一致するように、アーク発生期間の溶接電圧を制御する。また、パルスアーク溶接の場合は、溶接電圧検出部９の出力信号または溶接電圧検出部９の出力信号を平均化した平均値と溶接電圧一元化演算部１４の出力信号とが一致するように、パルス電流のパルス幅またはパルス周波数を制御する。
【００２７】
以上のように本実施の形態によれば、所定の極性比率に対応して溶接電圧指令値の補正を行うことのでき、溶接電圧の再調整作業を簡素化することができる。
【００２８】
（実施の形態２）
以下、本発明の溶接電圧制御方法および消耗電極式アーク溶接電源の実施の形態２について図面を参照しながら説明する。本発明は請求項１および請求項３に係わる。
【００２９】
図２は本実施の形態の構成を示すブロック図である。なお、図１に示した実施の形態１と同じ構成要素には同一番号を付与して詳細な説明を省略する。本実施の形態が実施の形態１と異なる点は、溶接電流設定部１０の出力信号と極性比率設定部１２の出力信号を補正量演算部１５に入力し、溶接電圧一元化演算部１４に溶接電流設定部１０の出力信号と溶接電圧微調整部１１の出力信号と補正量演算部１５の出力信号とを入力し、溶接電流指令値と極性比率に応じて溶接電圧指令値を補正するようにしたことにある。
【００３０】
上記構成においてその動作を説明する。まず、溶接電流設定部１０は、設定された所定の電流値に応じた出力信号を出力する。また、溶接電圧微調整設定部１１は、設定された所定の微調整値に応じた出力信号を出力する。さらに、極性比率設定部１２は、設定された所定の逆極性と正極性の比率に応じた出力信号を出力する。補正量演算部１５は、溶接電流設定部１０の出力信号と極性比率設定部１２の出力信号とを入力して、溶接電流設定部１０の出力信号の関数となる出力信号を出力する。
【００３１】
つぎに、溶接電圧一元化演算部１４は、溶接電流設定部１０の出力信号と溶接電圧微調整設定部１１の出力信号と極性比率設定部１２の出力信号とを入力して、溶接電流設定部１０で設定した所定の溶接電流に対応した溶接電圧指令値を決定するとともに、溶接電圧微調整設定部１１で設定した所定の第１の補正値と前記補正量演算部１５で演算した所定の溶接電流指令値と所定の極性の比率に応じた第２の補正値を前記溶接電圧指令値より加減算し決定した一元化電圧指令値を出力する。さらに、溶接電流検出部８は溶接出力電流を検出し、溶接電圧検出部９は、溶接出力電圧を検出する。
【００３２】
極性切換制御部１３は、極性比率設定部１２の出力信号を入力し、極性比率設定部１２の出力信号が逆極性を指令している場合には、第１スイッチング素子３をオン，第２スイッチング素子４をオフとし、溶接出力部２の出力する電圧を出力端子５と出力端子６との間に逆極性で供給し、また、極性比率設定部１２の出力信号が正極性を指令している場合には、第１スイッチング素子３をオフ，第２スイッチング素子４をオンとし、溶接出力部２が出力する電圧を出力端子５と出力端子６との間に正極性で供給する。
【００３３】
溶接出力制御部７は、溶接電流検出部８の出力信号と溶接電圧検出部９の出力信号と溶接電流設定部１０の出力信号と溶接電圧一元化演算部１４の出力信号とを入力し、溶接出力電流と設定電流または溶接出力電圧と設定電圧が一致するように溶接出力部２を制御し溶接電圧制御を行っている。
【００３４】
以上のように本実施の形態によれば、所定の極性比率と溶接電流指令値に対応して溶接電圧指令値の補正を行うことのでき、溶接電圧の再調整作業を簡素化することができる。
【００３５】
（実施の形態３）
以下、本発明の溶接電圧制御方法および消耗電極式アーク溶接電源の実施の形態３について図面を参照しながら説明する。本発明は請求項１および請求項４に係わる。
【００３６】
図３は本実施の形態の構成を示すブロック図である。なお、図２に示した実施の形態２と同じ構成要素には同一番号を付与して詳細な説明を省略する。本実施の形態が実施の形態２と異なる点は、極性比率設定部１２の出力信号とシールドガス設定部の出力信号と消耗電極設定部の出力信号を補正量演算部１５に入力し、極性比率とシールドガスの種類と消耗電極の種類に応じて溶接電圧指令値を補正するようにしたことにある。
【００３７】
上記構成においてその動作を説明する。まず、溶接電流設定部１０は、設定された所定の電流値に応じた出力信号を出力する。また、溶接電圧微調整設定部１１は、設定された所定の微調整値に応じた出力信号を出力する。さらに、極性比率設定部１２は、設定された所定の逆極性と正極性の比率に応じた出力信号を出力する。補正量演算部１５は、極性比率設定部１２の出力信号とシールドガス設定部１６の出力信号と消耗電極設定部１７の出力信号を入力して、シールドガス設定部１６の出力信号と消耗電極設定部１７の出力信号の関数となる出力信号を出力する。
【００３８】
つぎに、溶接電圧一元化演算部１４は、溶接電流設定部１０の出力信号と溶接電圧微調整設定部１１の出力信号と極性比率設定部１２の出力信号とを入力して、溶接電流設定部１０で設定した所定の溶接電流に対応した溶接電圧指令値を決定するとともに、溶接電圧微調整設定部１１で設定した所定の第１の補正値と前記補正量演算部１５で演算した所定の極性の比率とシールドガスの種類と消耗電極の種類に応じた第２の補正値を前記溶接電圧指令値より加減算し決定した一元化電圧指令値を出力する。さらに、溶接電流検出部８は溶接出力電流を検出し、溶接電圧検出部９は、溶接出力電圧を検出する。
【００３９】
極性切換制御部１３は、極性比率設定部１２の出力信号を入力し、極性比率設定部１２の出力信号が逆極性を指令している場合には、第１スイッチング素子３をオン，第２スイッチング素子４をオフとし、溶接出力部２の出力する電圧を出力端子５と出力端子６との間に逆極性で供給し、また、極性比率設定部１２の出力信号が正極性を指令している場合には、第１スイッチング素子３をオフ，第２スイッチング素子４をオンとし、溶接出力部２が出力する電圧を出力端子５と出力端子６との間に正極性で供給する。
【００４０】
溶接出力制御部７は、溶接電流検出部８の出力信号と溶接電圧検出部９の出力信号と溶接電流設定部１０の出力信号と溶接電圧一元化演算部１４の出力信号とを入力し、溶接出力電流と設定電流、または溶接出力電圧と設定電圧が一致するように溶接出力部２を制御し溶接電圧制御を行っている。
【００４１】
以上のように本実施の形態によれば、所定の極性比率とシールドガスの種類と消耗電極の種類に対応して溶接電圧指令値の補正を行うことのでき、溶接電圧の再調整作業を簡素化することができる。
【００４２】
また、実施の形態２および実施の形態３を組合せ、補正量演算部１５は、溶接電流指令値，シールドガスの種類，消耗電極の種類の関数としてもよい。
【００４３】
【発明の効果】
以上の説明から明らかなように、請求項１ないし請求項５に係わるいずれの本発明の溶接電圧制御方法および消耗電極式アーク溶接電源においても、逆極性と正極性の極性の比率に応じて溶接電圧を補正することによって、溶接電圧の再調整をする必要がなくなり、溶接条件調整の作業の改善ができる。
【００４４】
さらに、極性比率に対応した電圧補正値を溶接電流指令値，シールドガスの種類に応じて決定することにより、溶接状態に対応した適切な溶接電圧を得ることができる。
【図面の簡単な説明】
【図１】本発明の消耗電極式アーク溶接電源の実施の形態１の構成を示すブロック図
【図２】同実施の形態２の構成を示すブロック図
【図３】同実施の形態３の構成を示すブロック図
【図４】従来の消耗電極式アーク溶接電源の構成図
【符号の説明】
１入力交流電源
２溶接出力部
３第１スイッチング素子
４第２スイッチング素子
５，６出力端子
７溶接出力制御部
８溶接電流検出部
９溶接電圧検出部
１０溶接電流設定部
１１溶接電圧微調整設定部
１２極性比率設定部
１３極性切換制御部
１４溶接電圧一元化演算部
１５補正量演算部
１６シールドガス設定部
１７消耗電極設定部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a welding voltage control method and a consumable electrode arc in consumable electrode arc welding in which the welding output voltage applied between the consumable electrode and the base metal is alternately and repeatedly switched between a reverse polarity and a positive polarity. It relates to a welding power source.
[0002]
[Prior art]
In recent years, a consumable electrode arc welding power source that alternately and repeatedly switches the voltage applied between the consumable electrode and the base material with a reverse polarity and a positive polarity has a unified voltage command value corresponding only to the welding current command value. The welding voltage is controlled.
[0003]
Hereinafter, a conventional welding voltage control method and a consumable electrode type arc welding power source will be described with reference to the drawings.
[0004]
FIG. 4 is a block diagram showing a configuration of a conventional consumable electrode arc welding power source. In FIG. 4, 1 is an input AC power source, 2 is a welding output unit, 3 is a first switching element, 4 is a second switching element, 5 and 6 are output terminals, 7 is a welding output control unit, and 8 is a welding current detection unit. , 9 is a welding voltage detection unit, 10 is a welding current setting unit, 11 is a welding voltage fine adjustment setting unit, 12 is a polarity ratio setting unit, 13 is a polarity switching control unit, and 14 is a welding voltage unification operation unit.
[0005]
The operation of the above configuration will be described. First, the welding current setting unit 10 outputs an output signal corresponding to the set predetermined current value. Further, the polarity ratio setting unit 12 outputs an output signal corresponding to the set ratio of the reverse polarity and the positive polarity. Next, the welding voltage unification operation unit 14 inputs the output signal of the welding current setting unit 10 and the output signal of the welding voltage fine adjustment setting unit 11 and corresponds to a predetermined current value set by the welding current setting unit 10. A welding voltage command value is determined, and a unified voltage command value determined by adding or subtracting a predetermined correction value set by the welding voltage fine adjustment setting unit from the welding voltage command value is output. Moreover, the welding current detection part 8 detects a welding output current, and the welding voltage detection part 9 detects a welding output voltage.
[0006]
The polarity switching control unit 13 inputs the output signal of the polarity ratio setting unit 12, and when the output signal of the polarity ratio setting unit 12 commands reverse polarity, the first switching element 3 is turned on and the second switching is performed. The element 4 is turned off, the voltage output from the welding output unit 2 is supplied between the output terminal 5 and the output terminal 6 with a reverse polarity, and the output signal of the polarity ratio setting unit 12 commands positive polarity. In this case, the first switching element 3 is turned off, the second switching element 4 is turned on, and the voltage output from the welding output unit 2 is supplied between the output terminal 5 and the output terminal 6 with positive polarity.
[0007]
The welding output control unit 7 inputs the output signal of the welding current detection unit 8, the output signal of the welding voltage detection unit 9, the output signal of the welding current setting unit 10, and the output signal of the welding voltage unification calculation unit 14, and performs welding output. Welding control is performed by controlling the welding output unit 2 so that the current and the set current or the output voltage and the set voltage match.
[0008]
[Problems to be solved by the invention]
In such a conventional welding voltage control method and consumable electrode type arc welding power source, the appropriate welding voltage differs depending on the polarity ratio, so it is necessary to readjust the welding voltage by setting the polarity ratio. The amount of adjustment differs depending on the welding current command value, the type of shield gas, the type of consumable electrode, etc., and there is a problem that it is difficult to adjust the welding conditions.
[0009]
The present invention solves the above-described problem, and an object thereof is to provide a welding voltage control method and a consumable electrode type arc welding power source capable of correcting a welding current command value in accordance with a predetermined polarity ratio. .
[0010]
[Means for Solving the Problems]
The present invention according to claim 1 is a consumable electrode arc welding power source that alternately and repeatedly switches the polarity of the welding output voltage applied between the consumable electrode and the base material between a reverse polarity and a positive polarity. A welding voltage command value corresponding to the set predetermined welding current is determined, and set by a predetermined first correction value and polarity ratio setting unit for correcting the welding voltage command value set by the welding voltage fine adjustment setting unit. A welding voltage control method in which a welding voltage command value is determined by adding or subtracting a second correction value for correcting the welding voltage command value in accordance with a ratio of the predetermined polarity to the welding voltage command value. .
[0011]
According to the present invention, the welding voltage command value is corrected in accordance with the set polarity ratio, and the workability of adjustment of the welding conditions, particularly of the welding voltage can be improved.
[0012]
The present invention according to claim 2 is a consumable electrode type arc welding power supply that alternately and repeatedly switches the polarity of the welding output applied between the consumable electrode and the base material between a reverse polarity and a positive polarity, a welding current setting unit, A welding voltage fine adjustment setting unit, a polarity ratio setting unit for setting a predetermined ratio between reverse polarity and positive polarity, and a polarity switching control unit for controlling switching of polarity by inputting an output signal of the polarity ratio setting unit, A welding current detection unit that detects a current of the welding output, a welding voltage detection unit that detects a voltage of the welding output, an output signal of the welding current setting unit, an output signal of the welding voltage fine adjustment setting unit, and the A welding voltage unification operation unit that inputs an output signal of a polarity ratio setting unit to determine a welding voltage command value, an output signal of the welding current setting unit, an output signal of the welding voltage unification operation unit, and a welding current detection unit Output signal and A welding output control unit for controlling the output of the welding output by inputting an output signal of the welding voltage detection unit, and the welding voltage unification operation unit according to a predetermined welding current set by the welding current setting unit A welding voltage command value is determined, and a predetermined first correction value for correcting the welding voltage command value set by the welding voltage fine adjustment setting unit and a predetermined polarity ratio set by the polarity ratio setting unit. The consumable electrode arc welding power source is configured such that a second correction value for correcting the corresponding welding voltage command value is determined by adding or subtracting from the welding voltage command value.
[0013]
According to the present invention, the same operation and effect as the present invention according to claim 1 can be obtained.
[0014]
The present invention according to claim 3 is the welding voltage control method and the consumable electrode type arc welding power source in which the second correction value is determined by the welding current command value.
[0015]
According to the present invention, the same operation and effect as the present invention according to claim 1 can be obtained.
[0016]
According to a fourth aspect of the present invention, there is provided the welding voltage control method according to any one of the first and second aspects, wherein the second correction value is determined by the type of shielding gas and the diameter of the consumable electrode. It is a consumable electrode type arc welding power source.
[0017]
According to the present invention, the same operation and effect as the present invention according to claim 1 can be obtained.
[0018]
According to a fifth aspect of the present invention, there is provided the welding voltage control according to the first or second aspect, wherein the second correction value is determined by a welding current command value, a type of shield gas, and a type of consumable electrode. Method and consumable electrode arc welding power source.
[0019]
According to the present invention, the same operation and effect as the present invention according to claim 1 can be obtained.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
(Embodiment 1)
Hereinafter, a welding voltage control method and a consumable electrode type arc welding power source according to a first embodiment of the present invention will be described with reference to the drawings. The present invention relates to claims 1 and 2.
[0021]
FIG. 1 is a block diagram showing the configuration of the present embodiment. The same constituent elements as those in the conventional example shown in FIG. This embodiment is different from the conventional example in that the welding voltage unification operation unit inputs the output signal of the welding current setting unit 10, the output signal of the welding voltage fine adjustment unit 11, and the output signal of the polarity ratio setting unit 12, The welding setting command value is corrected according to the polarity ratio.
[0022]
The operation of the above configuration will be described. First, the welding current setting unit 10 outputs an output signal corresponding to the set predetermined current value. Moreover, the welding voltage fine adjustment setting part 11 outputs the output signal according to the set predetermined fine adjustment value. Further, the polarity ratio setting unit 12 outputs an output signal corresponding to the set ratio between the predetermined reverse polarity and the positive polarity.
[0023]
Next, the welding voltage unification operation unit 14 inputs the output signal of the welding current setting unit 10, the output signal of the welding voltage fine adjustment setting unit 11, and the output signal of the polarity ratio setting unit 12 to input the welding current setting unit 10. The welding voltage command value corresponding to the predetermined welding current set in step S3 is determined, the predetermined first correction value set in the welding voltage fine adjustment setting unit 11 and the predetermined polarity set in the polarity ratio setting unit 12 A unified voltage command value determined by adding and subtracting a second correction value corresponding to the ratio from the welding voltage command value is output. Further, the welding current detector 8 detects the welding output current, and the welding voltage detector 9 detects the welding output voltage.
[0024]
The polarity switching control unit 13 inputs the output signal of the polarity ratio setting unit 12, and when the output signal of the polarity ratio setting unit 12 commands reverse polarity, the first switching element 3 is turned on and the second switching is performed. The element 4 is turned off, the voltage output from the welding output unit 2 is supplied between the output terminal 5 and the output terminal 6 with a reverse polarity, and the output signal of the polarity ratio setting unit 12 commands positive polarity. In this case, the first switching element 3 is turned off, the second switching element 4 is turned on, and the voltage output from the welding output unit 2 is supplied between the output terminal 5 and the output terminal 6 with positive polarity.
[0025]
The welding output control unit 7 inputs the output signal of the welding current detection unit 8, the output signal of the welding voltage detection unit 9, the output signal of the welding current setting unit 10, and the output signal of the welding voltage unification calculation unit 14, and performs welding output. Welding voltage control is performed by controlling the welding output unit 2 so that the current and the set current or the welding output voltage and the set voltage match.
[0026]
Here, the welding output control unit 7 periodically superimposes a pulse current on the welding current and short arc welding in which welding proceeds while periodically repeating contact short-circuiting and arcing between the consumable electrode and the base material. The content of control during the arc generation period is different from that of pulse arc welding in which welding proceeds, and in the case of short arc welding, the output signal of the welding voltage detection unit 9 or the output signal of the welding voltage detection unit 9 is averaged. The welding voltage during the arc generation period is controlled so that the average value and the output signal of the welding voltage unification operation unit 14 match. Further, in the case of pulse arc welding, the pulse voltage is set so that the average value obtained by averaging the output signal of the welding voltage detection unit 9 or the output signal of the welding voltage detection unit 9 and the output signal of the welding voltage unification calculation unit 14 match. Control the pulse width or pulse frequency of the current.
[0027]
As described above, according to the present embodiment, the welding voltage command value can be corrected in accordance with a predetermined polarity ratio, and the welding voltage readjustment operation can be simplified.
[0028]
(Embodiment 2)
Hereinafter, a welding voltage control method and a consumable electrode type arc welding power source according to a second embodiment of the present invention will be described with reference to the drawings. The present invention relates to claims 1 and 3.
[0029]
FIG. 2 is a block diagram showing the configuration of the present embodiment. The same components as those in the first embodiment shown in FIG. This embodiment is different from the first embodiment in that the output signal of the welding current setting unit 10 and the output signal of the polarity ratio setting unit 12 are input to the correction amount calculation unit 15 and the welding current unification calculation unit 14 receives the welding current. The output signal of the setting unit 10, the output signal of the welding voltage fine adjustment unit 11, and the output signal of the correction amount calculation unit 15 are input, and the welding voltage command value is corrected according to the welding current command value and the polarity ratio. There is.
[0030]
The operation of the above configuration will be described. First, the welding current setting unit 10 outputs an output signal corresponding to the set predetermined current value. Moreover, the welding voltage fine adjustment setting part 11 outputs the output signal according to the set predetermined fine adjustment value. Further, the polarity ratio setting unit 12 outputs an output signal corresponding to the set ratio between the predetermined reverse polarity and the positive polarity. The correction amount calculation unit 15 inputs the output signal of the welding current setting unit 10 and the output signal of the polarity ratio setting unit 12 and outputs an output signal that is a function of the output signal of the welding current setting unit 10.
[0031]
Next, the welding voltage unification operation unit 14 inputs the output signal of the welding current setting unit 10, the output signal of the welding voltage fine adjustment setting unit 11, and the output signal of the polarity ratio setting unit 12 to input the welding current setting unit 10. The welding voltage command value corresponding to the predetermined welding current set in step S1 is determined, the predetermined first correction value set by the welding voltage fine adjustment setting unit 11 and the predetermined welding current calculated by the correction amount calculation unit 15 A unified voltage command value determined by adding and subtracting a second correction value corresponding to the ratio between the command value and a predetermined polarity from the welding voltage command value is output. Further, the welding current detector 8 detects the welding output current, and the welding voltage detector 9 detects the welding output voltage.
[0032]
The polarity switching control unit 13 inputs the output signal of the polarity ratio setting unit 12, and when the output signal of the polarity ratio setting unit 12 commands reverse polarity, the first switching element 3 is turned on and the second switching is performed. The element 4 is turned off, the voltage output from the welding output unit 2 is supplied between the output terminal 5 and the output terminal 6 with a reverse polarity, and the output signal of the polarity ratio setting unit 12 commands positive polarity. In this case, the first switching element 3 is turned off, the second switching element 4 is turned on, and the voltage output from the welding output unit 2 is supplied between the output terminal 5 and the output terminal 6 with positive polarity.
[0033]
The welding output control unit 7 inputs the output signal of the welding current detection unit 8, the output signal of the welding voltage detection unit 9, the output signal of the welding current setting unit 10, and the output signal of the welding voltage unification calculation unit 14, and performs welding output. Welding voltage control is performed by controlling the welding output unit 2 so that the current and the set current or the welding output voltage and the set voltage match.
[0034]
As described above, according to the present embodiment, the welding voltage command value can be corrected in accordance with the predetermined polarity ratio and the welding current command value, and the welding voltage readjustment operation can be simplified. .
[0035]
(Embodiment 3)
Hereinafter, a welding voltage control method and a consumable electrode arc welding power source according to a third embodiment of the present invention will be described with reference to the drawings. The present invention relates to claims 1 and 4.
[0036]
FIG. 3 is a block diagram showing the configuration of the present embodiment. It should be noted that the same components as those in the second embodiment shown in FIG. This embodiment is different from the second embodiment in that the output signal of the polarity ratio setting unit 12, the output signal of the shield gas setting unit, and the output signal of the consumable electrode setting unit are input to the correction amount calculation unit 15, and the polarity ratio The welding voltage command value is corrected in accordance with the type of shield gas and the type of consumable electrode.
[0037]
The operation of the above configuration will be described. First, the welding current setting unit 10 outputs an output signal corresponding to the set predetermined current value. Moreover, the welding voltage fine adjustment setting part 11 outputs the output signal according to the set predetermined fine adjustment value. Further, the polarity ratio setting unit 12 outputs an output signal corresponding to the set ratio between the predetermined reverse polarity and the positive polarity. The correction amount calculation unit 15 inputs the output signal of the polarity ratio setting unit 12, the output signal of the shield gas setting unit 16, and the output signal of the consumable electrode setting unit 17, and outputs the output signal of the shield gas setting unit 16 and the consumable electrode setting. An output signal that is a function of the output signal of the unit 17 is output.
[0038]
Next, the welding voltage unification operation unit 14 inputs the output signal of the welding current setting unit 10, the output signal of the welding voltage fine adjustment setting unit 11, and the output signal of the polarity ratio setting unit 12 to input the welding current setting unit 10. The welding voltage command value corresponding to the predetermined welding current set in step S3 is determined, and the predetermined first correction value set in the welding voltage fine adjustment setting unit 11 and the predetermined polarity calculated in the correction amount calculation unit 15 are set. A unified voltage command value determined by adding and subtracting a second correction value corresponding to the ratio, the type of shield gas, and the type of consumable electrode from the welding voltage command value is output. Further, the welding current detector 8 detects the welding output current, and the welding voltage detector 9 detects the welding output voltage.
[0039]
The polarity switching control unit 13 inputs the output signal of the polarity ratio setting unit 12, and when the output signal of the polarity ratio setting unit 12 commands reverse polarity, the first switching element 3 is turned on and the second switching is performed. The element 4 is turned off, the voltage output from the welding output unit 2 is supplied between the output terminal 5 and the output terminal 6 with a reverse polarity, and the output signal of the polarity ratio setting unit 12 commands positive polarity. In this case, the first switching element 3 is turned off, the second switching element 4 is turned on, and the voltage output from the welding output unit 2 is supplied between the output terminal 5 and the output terminal 6 with positive polarity.
[0040]
The welding output control unit 7 inputs the output signal of the welding current detection unit 8, the output signal of the welding voltage detection unit 9, the output signal of the welding current setting unit 10, and the output signal of the welding voltage unification calculation unit 14, and performs welding output. Welding voltage control is performed by controlling the welding output unit 2 so that the current and the set current or the welding output voltage and the set voltage match.
[0041]
As described above, according to the present embodiment, it is possible to correct the welding voltage command value in accordance with the predetermined polarity ratio, the type of shield gas, and the type of consumable electrode, thereby simplifying the readjustment of the welding voltage. Can be
[0042]
Further, by combining the second embodiment and the third embodiment, the correction amount calculation unit 15 may be a function of the welding current command value, the type of shield gas, and the type of consumable electrode.
[0043]
【The invention's effect】
As is apparent from the above description, in any of the welding voltage control methods and consumable electrode type arc welding power sources according to the present invention according to claims 1 to 5, welding is performed according to the ratio of the reverse polarity to the positive polarity. By correcting the voltage, there is no need to readjust the welding voltage, and the work for adjusting the welding conditions can be improved.
[0044]
Furthermore, by determining the voltage correction value corresponding to the polarity ratio according to the welding current command value and the type of shield gas, an appropriate welding voltage corresponding to the welding state can be obtained.
[Brief description of the drawings]
FIG. 1 is a block diagram showing the configuration of Embodiment 1 of a consumable electrode arc welding power source of the present invention. FIG. 2 is a block diagram showing the configuration of Embodiment 2. FIG. 3 is the configuration of Embodiment 3. [Fig. 4] Configuration diagram of a conventional consumable electrode arc welding power source [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Input AC power supply 2 Welding output part 3 1st switching element 4 2nd switching element 5, 6 Output terminal 7 Welding output control part 8 Welding current detection part 9 Welding voltage detection part 10 Welding current setting part 11 Welding voltage fine adjustment setting part 12 Polarity ratio setting unit 13 Polarity switching control unit 14 Welding voltage unification calculating unit 15 Correction amount calculating unit 16 Shield gas setting unit 17 Consumable electrode setting unit

Claims

In a consumable electrode arc welding power source that alternately and repeatedly switches the polarity of the welding output voltage applied between the consumable electrode and the base material between the reverse polarity and the positive polarity, according to the predetermined welding current set in the welding current setting section A welding voltage command value is determined, and a predetermined first correction value for correcting the welding voltage command value set by the welding voltage fine adjustment setting unit and a predetermined polarity ratio set by the polarity ratio setting unit welding voltage control method so as to determine the welding voltage command value and the second correction value for correcting the welding voltage command value by subtracting from the welding voltage command value.

In a consumable electrode arc welding power supply that alternately and repeatedly switches the polarity of the welding output applied between the consumable electrode and the base material between the reverse polarity and the positive polarity, the welding current setting unit, the welding voltage fine adjustment setting unit, A polarity ratio setting unit for setting a predetermined ratio between polarity and positive polarity, a polarity switching control unit for controlling switching of polarity by inputting an output signal of the polarity ratio setting unit, and detecting a current of the welding output The welding current detection unit, the welding voltage detection unit for detecting the voltage of the welding output, the output signal of the welding current setting unit, the output signal of the welding voltage fine adjustment setting unit, and the output signal of the polarity ratio setting unit are input. A welding voltage unification operation unit for determining a welding voltage command value, an output signal of the welding current setting unit, an output signal of the welding voltage unification operation unit, an output signal of the welding current detection unit, and an output of the welding voltage detection unit Output signal And a welding output control unit that controls the output of the welding output, and the welding voltage unification calculating unit determines a welding voltage command value corresponding to a predetermined welding current set by the welding current setting unit the welding voltage the welding voltage command value corresponding to a predetermined percentage of polarity set by the polarity ratio setting unit and the first correction value predetermined for correcting the welding voltage command value set in the fine adjustment setting unit the second correction value by adding or subtracting from the welding voltage command value determining manner consumable electrode arc welding power source for correcting.

The welding voltage control method and the consumable electrode type arc welding power source according to any one of claims 1 to 2, wherein the second correction value is determined by a polarity ratio and a welding current command value.

3. A welding voltage control method and a consumable electrode type arc welding power source according to claim 1, wherein the second correction value is determined by a polarity ratio, a type of shield gas, and a type of consumable electrode. .

3. The welding voltage control method and the consumable electrode arc according to claim 1, wherein the second correction value is determined by a polarity ratio, a welding current command value, a shield gas type, and a consumable electrode type. Welding power source.