JP3544381B2

JP3544381B2 - Method and structure for joining plate members

Info

Publication number: JP3544381B2
Application number: JP15564893A
Authority: JP
Inventors: 泰雄程塚; 匡飯田; 良一山鹿; 聡上田; 康夫今泉
Original assignee: Fuji Jukogyo KK
Current assignee: Subaru Corp
Priority date: 1993-06-25
Filing date: 1993-06-25
Publication date: 2004-07-21
Anticipated expiration: 2019-07-21
Also published as: JPH079134A

Description

【０００１】
【産業上の利用分野】
本発明は板部材の結合方法および結合構造に係わり、特に段違いに屈曲された段違い部及び一般部を具備する一方の板部材の段違い上に他方の板部材の端縁部を重ね、その段違い部と他方の板部材の端縁によって形成される板部材の合せ部に肉盛り溶接を行う板部材の結合方法及び結合構造に関する。
【０００２】
【従来の技術】
例えば、自動車製造工場における板部材の結合方法としては例えば図７に示すように、リアクォータパネル２１を段違いに屈曲させ、その外側にルーフパネル２２の端縁部２２ａを重ね、その段違い部２１ａとルーフパネル２２の端面２２ｂとの間に断面凹状の板部材の合せ部２３を形成し、ルーフパネル２２の板部材の合せ部２３の近傍を可動電極２４でリアクォータパネル２１側に押圧してスポット溶接を行い仮付けし、その後、肉盛り溶接により二点鎖線２５で示すように肉盛りが施されていた。しかし、このような結合方法では、スポット溶接時に可動電極２４によりルーフパネル２２がリアクォータパネル２１に強圧されるためルーフパネル２２の表面に円形凹陥状の打痕２２ａ′が残る。したがって、スポット溶接終了後に外観上からこの打痕２２ａ′を消去する必要があり、そのため凹陥部２２ａ′に充填材を詰める等の作業を要していた。
【０００３】
この対策として、溶接打痕を残すことなく２枚の板部材を接合する方法として特開昭６３−５６３６６号公報による溶接方法が提案されている。この溶接方法は、図８に要部断面を示すように、例えば一方の板部材であるリアクォータパネル２１を段違いに屈曲させ、その段違い部２１ａ上に他方の板部材であるルーフパネル２２の端縁部２２ａを重ね合せ、リアクォータパネル２１とルーフパネル２２の端面２２ｂとによって板部材の合せ部２３を形成し、ルーフパネル２２の端面２２ｂに可動電極２４を当接してインダイレクトスポット溶接する。
【０００４】
その後、板部材の合せ部２３に二点鎖線２５で示すように肉盛り溶接を行う。この肉盛り溶接は、図９に示すように板部材の合せ部２３の近傍に冷し金具２６を配置し、ガスノズル２７によって不活性ガス２８で溶加材である金属電極２９を包むようにして溶接部に送吹し、大気中の酸素や窒素などの悪影響を受けないようにして溶接するＭＩＧ溶接法によって行われる。肉盛り溶接が終了すると、グラインダ等により溶接表面が平滑になるように仕上げ加工が行われる。
【０００５】
【発明が解決しようとする課題】
上記板部材の結合方法によると、一方の板部材の端面に可動電極を当接・加圧してスポット溶接を行い、その後板部材の合せ部に肉盛り溶接を施すことから、仮付け時のスポット溶接による溶接打痕を板部材の表面に残すことなく２枚の板部材を溶接結合することができる。
【０００６】
しかし、一方の板部材を段違いに屈曲させ、その段違い部上に他方の板部材の端縁部を重ね合せることから、端縁部端面にバリやだれがあると、両板部材間の接合性が悪く、また屈曲部と端面とにより板部材の合せ部を形成し、この板部材の合せ部に肉盛り溶接を行うことから、肉盛りによる溶接面積が狭く、充分な溶接強度の確保が得がたい。また肉盛り溶接により局部的に加熱されることに起因して板部材の熱歪が大きく、かつヒケが発生する。この対策として板部材の裏面側から叩き出し、かつ表面側にグラインダ等による研削を繰り返す仕上加工作業を要する。この仕上加工作業には作業者の熟練を要し作業者個人の技量に頼る作業であることから仕上品質の低下や、板部材の板厚減少等の品質低下を招くことがあり、また繰返し作業でありかつ板部材表面外に残る溶接部材の量が大であることと相俟って仕上加工工数の増加及び研削粉等による作業環境の悪化を招く等の不具合がある。
【０００７】
従って本発明の目的は、肉盛り溶接による板部材の熱歪及びヒケ等の変形を抑制することにより仕上加工作業の軽減及び作業環境の向上が図れ、かつ高強度、高品質の結合部が得られる板部材の結合方法及び結合構造を提供することにある。
【０００８】
上記目的を達成する本発明による板部材の結合方法は、一般部及び段違い部を具備する段違いに屈曲された一方の板部材の前記段違い部上に他方の板部材の端縁部を重ね、その段違い部と他方の板部材の端面によって形成される板部材の合せ部に肉盛り溶接を施す板部材の結合方法において、前記段違い部に他方の板部材の端面との当接を回避し、かつ前記板部材の合せ部に連続する凹条部及び前記他方の板部材の端面から離間した裏面に頂部が当接する凸条部を形成し、この凸条部に他方の板部材を重ね合せて板部材の合せ部及び凹条部内に充填すべく肉盛り溶接を施し、更に溶接部を表面側から研削による仕上げ加工を施すことにある。
【０００９】
上記目的を達成する本発明における板部材の結合構造は、段違いに屈曲された一方の板部材上に他方の板部材の端縁部を重ね合せ、その段違い部と他方の板部材の端面によって形成される板部材の合せ部に肉盛り溶接を施した板部材の結合構造において、前記段違い部が、他方の板部材の端面との当接を回避し、かつ前記板部材の合せ部と連続する凹条部と、他方の板部材の端面から離間した他方の板部材の裏面に当接する凸条部とを有し、前記凸条部に他方の板部材を重ね合せて板部材の合せ部及び凹条部内に充填して肉盛り溶接したことを特徴とするものである。
【００１０】
【実施例】
以下本発明による板部材の結合方法及び結合構造の一実施例を自動車製造工程におけるリアクォータパネルとルーフパネルとを結合する場合を例に説明する。
【００１１】
図１は自動車の車体後部斜視図であり、符号１は一方の板部材であるリアクォータパネル、２は他方の板部材であるルーフパネルである。
【００１２】
図２は図１のＡ−Ａ線に沿う要部断面斜視図であってリアクォータパネル１の端縁部１ａは一般部１ｂから段違いに屈曲された段違い部１ｃを有し、段違い部１ｃ上に他方の板部材であるルーフパネル２の端縁部２ａを重ね合せ、段違い部１ｃと、ルーフパネル２の端面２ｂによって形成される板部材の合せ部４にブレーズアーク溶接による肉盛り溶接によってリアクォータパネル１とルーフパネル２とが溶接結合されている。
【００１３】
リアクォータパネル１に形成される段違い部１ｃは、段違い部１ｃ上に重ね合せるルーフパネル２の端面２ｂとの当接を回避し、かつ板部材の合せ部４に肉盛り溶接される溶融金属５の溶込みがルーフパネル２の端縁部２ａの裏面２ｃに達するよう凹条部１ｄ及び、ルーフパネル２の端面２ｂから離間した当接部２ｄに当接する凸条部１ｅが形成されている。
【００１４】
次にこのように構成されるリアクォータパネル１とルーフパネル２との結合方法について図２のＢ−Ｂ線断面を示す図３乃至図４によって説明する。
【００１５】
本実施例に用いられるリアクォータパネル１の板厚ｔ₁ 及びルーフパネル２の板厚ｔ₂ は各々約０．７５ｍｍであり、リアクォータパネル１の段違い部１ａに形成される凹条部１ｄの溝幅ｔ₃ が約４．０ｍｍ、凸条部１ｅの頂部１ｅ′から凹条部１ｄの底部までの深さｔ₄ が約０．５ｍｍに形成されている。
【００１６】
このように形成されたリアクォータパネル１の端縁部１ａに対し、ルーフパネル２の端面２ｂとリアクォータパネル１の凹条部１ｄとによって形成される板部材の合せ部４の開口幅が約１．０ｍｍであって、端面２ｂの表面側角部２ｆがリアクォータ１の一般部１ｂの表面より約０．１ｍｍの突出量ｔ₅ を有するように、リアクォータ１の凸条部１ｅの頂部１ｅ′にルーフパネル２の当接部２ｄを重ね合せ、溶接治具（図示せず）によってリアクォータパネル１及びルーフパネル２の相対位置を保持する。溶接治具によって相対位置が保持されたリアクォータパネル１とルーフパネル２は、リアクォータパネル１の凸条部１ｅと、ルーフパネル２の端面２ｂから離間した当接部２ｄを重ね合されることからバリやだれの発生し易いルーフパネル２の端面２ｂがリアクォータパネル１と当接することが回避され、ルーフパネル２の端面２ｂにバリやだれが生じた場合でも良好な接合性が確保できる。
【００１７】
次に溶接治具によって保持されたリアクォータパネル１とルーフパネル２の端縁部１ａ及び２ａをブレーズアーク溶接による肉盛り溶接により結合する。
【００１８】
この肉盛り溶接は、リアクォータパネル１とルーフパネル２との相対位置が維持された状態で行われ、図４に示すようにガスノズル１１によって不活性ガス１２を溶加材である金属電極１３を包むようにして溶接部３である板部材の合せ部４に向けて送吹するブレーズアーク溶接によって行われる。
【００１９】
肉盛り溶接による溶融金属５は板部材の合せ部４及び段違い部１ｃに形成した凹条部１ｄ内に充填され、リアクォータパネル１とルーフパネル２の端縁部１ａ及び２ａに溶込み両部材を結合する。
【００２０】
上記肉盛り溶接にあたって溶融金属５が、板部材の合せ部４のみでなく、凹条部１ｄ内にも充填されることから溶込み範囲がルーフパネル２の端縁部２ａの裏面２ｃ及び凹条部１ｄにも達し、溶込み範囲が板部材の合せ部４のみであった従来の肉盛り溶接に比べ、大幅に溶接面積が増大され、放熱効果が大となり、局部的な加熱が回避される。従ってリアクォータパネル１及びルーフパネル２の熱歪及びヒケが抑制されてリアクォータパネル１及びルーフパネル２の変形が小さくなり、かつ溶接面積の増大に伴って溶接部３の強度が増大する。
【００２１】
肉盛り溶接に続いて、溶接部３表面が平滑になるよう仕上加工を行う。仕上加工作業は、リアクォータパネル１とルーフパネル２との結合部及びその周辺に発生する熱歪、ヒケ等の変形が抑制されて溶接結合されることから、結合部の裏面側からの叩き出し作業の省略乃至大幅な削減が可能になり、表面からのグラインダ等による削減作業のみでほぼ対処できる。
【００２２】
研削作業は、主に板部材の合せ部４からリアクォータパネル１及びルーフパネル２上に突出した溶着金属５ａのグラインダ等による研削及び研削部分を平滑にするための仕上げ代となる前記予めリアクォータパネル１の一般部１ｂより突出形成したルーフパネル２の端縁部２ａの研削で平滑面が得られ、従来の溶接歪等に起因する広範囲の研削が不要になり研削作業の大幅な削減、及び研削粉による作業環境の悪化の回避が可能になり、かつ平滑面を得るための研削によるリアクォータパネル１及びルーフパネル２の大幅な板厚減少による剛性強度の低下が回避される。
【００２３】
次に図５及び図６によって本発明の別な実施例について説明する。
【００２４】
図５は上記図３に、図６は図４に各々対応し、図３及び図４と対応する部位に同一符号を付することで詳細な説明を省略するが、図５に示すようにリアクォータパネル１の段違い部１ｃに隣接する一般部１ｂに板部材の合せ部４に沿って一般部１ｂより突出量ｔ₆ 、例えば約０．１〜０．２ｍｍ突出する突出部１ｆを形成する一方、ルーフパネル２の端縁部２ａの端面２ｂからリアクォータパネル１の段違い部１ｃに形成した凸条部１ｃと当接する間を外方に突出量ｔ₇ 、例えば約０．１〜０．２ｍｍ突出させて突出部２ｆが形成されている。
【００２５】
このように形成されたリアクォータパネル１及びルーフパネル２を溶接治具により固定し、図６に示すように板部材の合せ部４に肉盛り溶接を行う。肉盛り溶接による溶融金属５は板部材の合せ部４及び段違い部１ｃに形成した凹条部１ｄ内に充填され、リアクォータパネル１及びルーフパネル２の端縁部１ａ及び２ａに溶け込み両部材を溶接結合する。
【００２６】
肉盛り溶接にあたっては、前記実施例同様、溶融金属５が板部材の合せ部４のみでなく凹条部１ｄ内にも達することから、ルーフパネル２の裏面２ｃ及び凹条部１ｄに溶け込み、溶接面積が増大する。溶接面積の増大及び突出部１ｆ乃至２ｆによる剛性向上と相俟って溶接部３の強度が増大し、かつ局部的な加熱が回避され、リアクォータパネル１及びルーフパネル２の熱歪及びヒケが抑制される。
【００２７】
肉盛り溶接に続く仕上加工作業は上記実施例同様結合部裏面側からの叩き出し作業の省略乃至大幅な削減が可能になる。
【００２８】
研削作業は、主に板部材の合せ部４からリアクォータパネル１及びルーフパネル２上に突出した溶着金属５ａのグラインダ等による研削及び溶接部分を平滑にするための代上げ代となるリアクォータパネル１に形成した突出部１ｆとルーフパネル２に形成した突出部２ｆの研削で平滑面が得られ、従来の研削面積に比べ大幅な研削面積の削減が図れ、かつリアクォータパネル１及びルーフパネル２の研削量の減少に伴い、充分な板厚が確保でき、剛性強度の低下が阻止できる。
【００２９】
以上説明した本実施例によれば、リアクォータパネル１の凸条部１ｅとルーフパネル２の端面２ｂから離間した当接部２ｄを重合することからバリ、だれ等の生じ易いルーフパネル２の端面２ｂがリアクォータパネル１と当接することが回避され、両部材の接合性が良好になり組付精度が確保できる。更に、肉盛り溶接にあたって溶融金属５が板部材の合せ部４のみでなく、凹条部１ｄ内にも充填されることから、リアクォータパネル１とルーフパネル２との溶接面積の増大が図れ、放熱面積が大となり、放熱効果が向上して局部的な加熱が回避でき、リアクォータパネル１及びルーフパネル２の熱歪及びヒケマークの発生が抑制されてパネル１、２の変形が抑えられ、かつ溶接面積の増大に伴い溶接部の強度が増加する。
【００３０】
リアクォータパネル１及びルーフパネル２の接合性の向上及び肉盛り溶接に伴うパネル１及び２の変形が抑制されることから、結合部の裏面側からの叩き出し作業の省略乃至大幅な削減が可能になり、研削作業のみで対処でき、研削作業は主に板部材の合せ部４からリアクォータパネル１及びルーフパネル２上に突出した溶着金属５ａの研削で平滑面が得られることから研削面積が削減され、仕上げ作業の大幅な簡素化及び作業環境の向上が図れ、リアクォータパネル１及びルーフパネル２の板厚減少による剛性強度の低下が回避され、高品質の結合部が得られる。
【００３１】
以上説明では、リアクォータパネルとルーフパネルとの結合方法及び構造について説明したが、リアクォータパネルとリアスカート等、パネル間を肉盛り溶接により結合する他自動車車体の板部材結合部及び他の分野における板部材の結合部に広く適用し得るのである。
【００３２】
【発明の効果】
以上説明した本発明による板部材の結合方法及び結合構造によれば、板部材の端面が他の板部材と当接することが回避され、両部材の接合性が良好になり組付精度が確保でき、更に肉盛り溶接にあたって溶接金属が板部材の合せ部のみでなく、凹条部にも達することから溶接面積の増大が図れ、放熱効果が向上して局部的な加熱が回避され、熱歪等による変形が抑制され、かつ溶接部の強度が増加する。更に板部材の変形が抑制されることから、仕上加工における結合部の裏面側からの叩き出しが省略乃至大幅な削減が図れかつ研削面積及び研削量の削減が得られ、仕上加工の軽減及び板部材の板厚が確保でき剛性強度の低下が阻止できる等高品質の板部材の結合部が得られる等本発明特有の効果を有する。
【図面の簡単な説明】
【図１】本発明による板部材の結合方法及び結合構造の一実施例を説明するための自動車車体後部の斜視図である。
【図２】図１のＡ−Ａ線に沿う断面斜視図である。
【図３】本実施例における板部材の結合方法の説明図である。
【図４】同じく、本実施例における板部材の結合方法の説明図である。
【図５】本実施例における板部材の結合方法及び結合構造の他の実施例の説明図である。
【図６】同じく、他の実施例の説明図である。
【図７】従来の板部材の結合方法の説明図である。
【図８】同じく、従来の板部材の結合方法の説明図である。
【図９】同じく、従来の板部材の結合方法の説明図である。
【符号の説明】
１リアクォータパネル
１ａ端縁部
１ｂ一般部
１ｃ段違い部
１ｄ凹条部
１ｅ凸条部
２ルーフパネル
２ａ端縁部
２ｂ端面
４板部材の合せ部
５溶接金属[0001]
[Industrial applications]
The present invention relates to a joining method and a joining structure of plate members, and more particularly, to superimpose an edge portion of another plate member on a step portion of one plate member having a step portion bent and a general portion, and the step portion thereof. The present invention relates to a joining method and a joining structure of a plate member for performing build-up welding on a joining portion of a plate member formed by an edge of the other plate member.
[0002]
[Prior art]
For example, as a method for joining plate members in an automobile manufacturing plant, as shown in FIG. 7, for example, the rear quarter panel 21 is bent stepwise, and the edge 22a of the roof panel 22 is superimposed on the outside, and the stepped part 21a is A mating portion 23 of a plate member having a concave cross section is formed between the end surface 22b of the roof panel 22 and the vicinity of the mating portion 23 of the plate member of the roof panel 22 is pressed toward the rear quarter panel 21 by the movable electrode 24 to form a spot. Welding and tacking were performed, and then overlaying was performed by overlay welding as shown by a two-dot chain line 25. However, in such a joining method, the roof panel 22 is strongly pressed against the rear quarter panel 21 by the movable electrode 24 during spot welding, so that a circular concave dent 22a 'remains on the surface of the roof panel 22. Therefore, it is necessary to erase the dents 22a 'from the appearance after the end of the spot welding, so that a work such as filling the recess 22a' with a filler is required.
[0003]
As a countermeasure, a welding method disclosed in JP-A-63-56366 has been proposed as a method of joining two plate members without leaving welding dents. In this welding method, for example, as shown in a sectional view of a main part in FIG. 8, a rear quarter panel 21 as one plate member is bent stepwise, and an end of a roof panel 22 as another plate member is placed on the stepped portion 21a. The edge portions 22a are overlapped, a joining portion 23 of a plate member is formed by the rear quarter panel 21 and the end face 22b of the roof panel 22, and the movable electrode 24 is brought into contact with the end face 22b of the roof panel 22 to perform indirect spot welding.
[0004]
Thereafter, overlay welding is performed on the joining portion 23 of the plate member as indicated by a two-dot chain line 25. In this build-up welding, as shown in FIG. 9, a cooling metal fitting 26 is arranged near the mating portion 23 of the plate member, and a gas nozzle 27 wraps a metal electrode 29 which is a filler material with an inert gas 28 so as to form a welding portion. The welding is performed by the MIG welding method in which the air is blown to the air and welded so as not to be adversely affected by oxygen or nitrogen in the atmosphere. When the build-up welding is completed, finishing is performed by a grinder or the like so that the welding surface becomes smooth.
[0005]
[Problems to be solved by the invention]
According to the joining method of the plate members, the movable electrode is brought into contact with and pressurized on the end face of one of the plate members to perform spot welding, and then the overlaying portion is welded to the joining portion of the plate members. The two plate members can be welded together without leaving a welding dent due to welding on the surface of the plate member.
[0006]
However, since one plate member is bent stepwise and the edge portion of the other plate member is overlapped on the stepped portion, if there is a burr or droop on the end surface of the edge portion, the joining property between the two plate members is reduced. In addition, since the joining portion of the plate member is formed by the bent portion and the end face and the overlay welding is performed on the joining portion of the plate member, the welding area by the overlay is narrow, and it is difficult to obtain sufficient welding strength. . In addition, heat distortion of the plate member is large and sink occurs due to local heating by overlay welding. As a countermeasure, a finishing work is required in which the plate member is beaten from the back side and the front side is repeatedly ground with a grinder or the like. Since this finishing work requires the skill of the worker and depends on the skill of the worker himself, there is a possibility that the finishing quality is reduced and the quality such as the thickness of the plate member is reduced. In addition to the fact that the amount of the welding member remaining outside the surface of the plate member is large, there are disadvantages such as an increase in the number of finishing steps and deterioration of the working environment due to grinding powder and the like.
[0007]
Accordingly, an object of the present invention is to suppress the deformation of a plate member due to build-up welding, such as heat distortion and sink mark, thereby reducing the finishing work and improving the working environment, and obtaining a high-strength, high-quality joint. It is an object of the present invention to provide a connecting method and a connecting structure for a plate member to be used.
[0008]
In order to achieve the above object, a method of joining a plate member according to the present invention is to overlap an edge portion of another plate member on the stepped portion of one plate member having a stepped portion having a general portion and a stepped portion. In the joining method of a plate member for performing build-up welding on a joining portion of a plate member formed by a stepped portion and an end surface of the other plate member, avoiding contact of the stepped portion with an end surface of the other plate member, and A concave ridge that is continuous with the mating portion of the plate member and a convex ridge that abuts on the back surface separated from the end surface of the other plate member are formed, and the other plate member is overlapped with the convex ridge to form a plate. The purpose of the present invention is to perform build-up welding so as to fill the mating portion and the concave portion of the member with each other, and further to perform the finishing process by grinding the welded portion from the surface side.
[0009]
In order to achieve the above object, in the present invention, the connecting structure of the plate members is formed by superimposing the edge portion of the other plate member on one of the plate members bent stepwise, and forming the stepped portion and the end surface of the other plate member. In the joining structure of the plate members in which the welded portions of the plate members are subjected to the build-up welding, the stepped portion avoids contact with the end surface of the other plate member and is continuous with the joined portion of the plate members. A concave ridge portion, and a convex ridge portion that is in contact with the back surface of the other plate member separated from the end surface of the other plate member, and the other plate member is overlapped with the convex ridge portion, and a mating portion of the plate member and It is characterized in that the recessed portion is filled and overlaid and welded.
[0010]
【Example】
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for connecting plate members and a connection structure according to the present invention will be described below, taking as an example the case where a rear quarter panel and a roof panel are connected in an automobile manufacturing process.
[0011]
FIG. 1 is a rear perspective view of a vehicle body of an automobile. Reference numeral 1 denotes a rear quarter panel as one plate member, and reference numeral 2 denotes a roof panel as the other plate member.
[0012]
FIG. 2 is a cross-sectional perspective view of a main part along the line AA in FIG. 1, wherein an edge 1a of the rear quarter panel 1 has a stepped portion 1c bent stepwise from the general portion 1b, and is located on the stepped portion 1c. The edge 2a of the roof panel 2, which is the other plate member, is overlapped with the other, and the joining portion 4 of the plate member formed by the stepped portion 1c and the end surface 2b of the roof panel 2 is rearward-welded by blazed arc welding. The quarter panel 1 and the roof panel 2 are connected by welding.
[0013]
The stepped portion 1c formed on the rear quarter panel 1 avoids contact with the end face 2b of the roof panel 2 to be superimposed on the stepped portion 1c, and has a molten metal 5 which is overlay-welded to the joining portion 4 of the plate member. Is formed so as to reach the rear surface 2c of the edge portion 2a of the roof panel 2 and a convex ridge portion 1e that comes into contact with a contact portion 2d separated from the end surface 2b of the roof panel 2.
[0014]
Next, a method of connecting the rear quarter panel 1 and the roof panel 2 configured as described above will be described with reference to FIGS.
[0015]
Thickness t ₁ and the thickness t ₂ of the roof panel 2 of the rear quarter panel 1 used in this embodiment are each approximately 0.75 mm, the concave portion 1d formed on the stepped portion 1a of the rear quarter panel 1 the groove width t ₃ of about 4.0 mm, a depth from the top portion 1e of the convex portion 1e 'to the bottom of the concave portion 1d t ₄ is formed in approximately 0.5 mm.
[0016]
The opening width of the mating portion 4 of the plate member formed by the end surface 2b of the roof panel 2 and the recessed portion 1d of the rear quarter panel 1 is approximately equal to the edge 1a of the rear quarter panel 1 thus formed. a 1.0 mm, so that the surface side corner portion 2f of the end face 2b have the general portion protruding amount t ₅ to about 0.1mm from the surface of the 1b of rear quarter 1, the top of the convex portion 1e of the rear quarter 1 The contact portion 2d of the roof panel 2 is superimposed on 1e ', and the relative positions of the rear quarter panel 1 and the roof panel 2 are held by a welding jig (not shown). The rear quarter panel 1 and the roof panel 2 whose relative positions are held by the welding jig are overlapped with the protruding ridge portion 1e of the rear quarter panel 1 and the contact portion 2d separated from the end surface 2b of the roof panel 2. The end face 2b of the roof panel 2 where burrs and drooling are likely to occur is prevented from abutting on the rear quarter panel 1, and good jointability can be ensured even when burrs and drooling occur on the end face 2b of the roof panel 2.
[0017]
Next, the edge portions 1a and 2a of the rear quarter panel 1 and the roof panel 2 held by the welding jig are joined by overlay welding by blaze arc welding.
[0018]
This build-up welding is performed in a state where the relative position between the rear quarter panel 1 and the roof panel 2 is maintained, and as shown in FIG. It is performed by blaze arc welding in which the air is blown toward the joining portion 4 of the plate member as the welding portion 3 so as to wrap.
[0019]
The molten metal 5 formed by build-up welding is filled into the joint portion 4 of the plate member and the recessed portion 1d formed in the stepped portion 1c, and is melted into the edge portions 1a and 2a of the rear quarter panel 1 and the roof panel 2 To join.
[0020]
In the overlay welding, the molten metal 5 is filled not only in the mating portion 4 of the plate member but also in the recessed portion 1d, so that the penetration range is limited to the back surface 2c of the edge 2a of the roof panel 2 and the recessed portion. Part 1d, the welding area is greatly increased as compared with the conventional overlay welding in which the penetration range is only the joining part 4 of the plate member, the heat radiation effect is increased, and local heating is avoided. . Therefore, the thermal distortion and sink marks of the rear quarter panel 1 and the roof panel 2 are suppressed, the deformation of the rear quarter panel 1 and the roof panel 2 is reduced, and the strength of the welded portion 3 is increased as the welding area is increased.
[0021]
Subsequent to the overlay welding, a finishing process is performed so that the surface of the welded portion 3 becomes smooth. In the finishing work, the joint between the rear quarter panel 1 and the roof panel 2 and the deformation around the periphery thereof, such as heat distortion and sink marks, are suppressed and welded together. It is possible to omit or significantly reduce the work, and it is almost possible to cope with only the reduction work using a grinder or the like from the surface.
[0022]
The grinding operation is mainly performed by grinding the welded metal 5a protruding from the joining portion 4 of the plate members onto the rear quarter panel 1 and the roof panel 2 by a grinder or the like, and a finishing allowance for smoothing the ground portion. By grinding the edge 2a of the roof panel 2 protruding from the general portion 1b of the panel 1, a smooth surface can be obtained, so that a wide range of grinding caused by conventional welding distortion and the like is not required, and the grinding work is greatly reduced. Deterioration of the working environment due to the grinding powder can be avoided, and rigidity deterioration due to a large decrease in the thickness of the rear quarter panel 1 and the roof panel 2 due to grinding for obtaining a smooth surface can be avoided.
[0023]
Next, another embodiment of the present invention will be described with reference to FIGS.
[0024]
5 corresponds to FIG. 3, and FIG. 6 corresponds to FIG. 4, and the detailed description is omitted by giving the same reference numerals to the parts corresponding to FIGS. 3 and 4. However, as shown in FIG. generally portion 1b projecting amount than the general portion 1b along the mating portion 4 of the plate member to t ₆ adjacent to the stepped portion 1c quota panel 1, while forming a projecting portion 1f projecting example about 0.1~0.2mm An outwardly projecting amount t ₇ , for example, about 0.1 to 0.2 mm, between the end face 2 b of the edge 2 a of the roof panel 2 and the ridge 1 c formed on the stepped part 1 c of the rear quarter panel 1. A protruding portion 2f is formed to protrude.
[0025]
The rear quarter panel 1 and the roof panel 2 formed in this way are fixed by a welding jig, and overlay welding is performed on the mating portion 4 of the plate member as shown in FIG. The molten metal 5 by the overlay welding is filled in the concave portion 1d formed in the joining portion 4 and the stepped portion 1c of the plate member, and is melted into the edge portions 1a and 2a of the rear quarter panel 1 and the roof panel 2 so that the two members are joined. Join by welding.
[0026]
In the overlay welding, as in the above-described embodiment, since the molten metal 5 reaches not only the joining portion 4 of the plate member but also the inside of the concave portion 1d, the molten metal 5 melts into the rear surface 2c and the concave portion 1d of the roof panel 2 and is welded. The area increases. Along with the increase in the welding area and the improvement in rigidity due to the projections 1f to 2f, the strength of the welded portion 3 is increased, local heating is avoided, and thermal distortion and sink marks of the rear quarter panel 1 and the roof panel 2 are reduced. Be suppressed.
[0027]
In the finishing work following the build-up welding, it is possible to omit or drastically reduce the work of punching out from the back side of the joint portion as in the above embodiment.
[0028]
The grinding operation is mainly performed by a rear quarter panel as a substitute for smoothing the grinding and welding of the weld metal 5a protruding from the joining portion 4 of the plate members onto the rear quarter panel 1 and the roof panel 2 by a grinder or the like. 1 and the projection 2f formed on the roof panel 2 can be ground to obtain a smooth surface, a large reduction in the grinding area as compared with the conventional grinding area, and the rear quarter panel 1 and the roof panel 2 As the grinding amount decreases, a sufficient plate thickness can be secured, and a decrease in rigidity can be prevented.
[0029]
According to the present embodiment described above, since the convex portion 1e of the rear quarter panel 1 and the contact portion 2d separated from the end surface 2b of the roof panel 2 are superimposed, the end surface of the roof panel 2 where burrs, drooling and the like are liable to occur. The contact of the rear member 2b with the rear quarter panel 1 is avoided, and the joining properties of both members are improved, so that the assembling accuracy can be secured. Further, since the molten metal 5 is filled not only in the mating portion 4 of the plate member but also in the concave ridge portion 1d at the time of overlay welding, the welding area between the rear quarter panel 1 and the roof panel 2 can be increased, The heat radiation area is large, the heat radiation effect is improved, local heating can be avoided, and the heat distortion and sink marks of the rear quarter panel 1 and the roof panel 2 are suppressed, and the deformation of the panels 1, 2 is suppressed, and As the weld area increases, the strength of the weld increases.
[0030]
Since the improvement of the jointability between the rear quarter panel 1 and the roof panel 2 and the deformation of the panels 1 and 2 due to the overlay welding are suppressed, it is possible to omit or drastically reduce the work of punching from the back side of the joint. The grinding work can be dealt with only by the grinding work, and the grinding work is mainly performed by grinding the weld metal 5a protruding from the joining portion 4 of the plate members onto the rear quarter panel 1 and the roof panel 2 so that a smooth surface is obtained. Therefore, the finishing work can be greatly simplified and the working environment can be improved, the rigidity of the rear quarter panel 1 and the roof panel 2 can be prevented from being reduced due to the reduced thickness, and a high quality joint can be obtained.
[0031]
In the above description, the method and structure for connecting the rear quarter panel and the roof panel have been described. However, the rear quarter panel and the rear skirt, etc., which connect the panels by build-up welding and other plate member connection portions of the automobile body and other fields The present invention can be widely applied to the joint portion of the plate member in the above.
[0032]
【The invention's effect】
According to the joining method and the joining structure of the plate members according to the present invention described above, the end surface of the plate member is prevented from coming into contact with another plate member, and the joining property of both members is improved, and the assembling accuracy can be secured. In addition, in the overlay welding, the weld metal reaches not only the joining portion of the plate members but also the concave portion, so that the welding area can be increased, the heat radiation effect is improved, local heating is avoided, and heat distortion, etc. Deformation is suppressed, and the strength of the welded portion is increased. Further, since the deformation of the plate member is suppressed, punching out from the back surface side of the joint portion in the finishing process can be omitted or greatly reduced, and the grinding area and the grinding amount can be reduced. The present invention has an effect peculiar to the present invention, such as obtaining a joint portion of a high-quality plate member such as securing a plate thickness of the member and preventing a decrease in rigidity.
[Brief description of the drawings]
FIG. 1 is a perspective view of a rear portion of an automobile body for explaining an embodiment of a method and a structure for connecting plate members according to the present invention.
FIG. 2 is a sectional perspective view taken along line AA of FIG.
FIG. 3 is an explanatory diagram of a method of joining plate members in the present embodiment.
FIG. 4 is an explanatory view of a method of connecting plate members in the embodiment.
FIG. 5 is an explanatory view of another embodiment of the joining method and the joining structure of the plate members in the present embodiment.
FIG. 6 is an explanatory diagram of another embodiment.
FIG. 7 is an explanatory view of a conventional method of connecting plate members.
FIG. 8 is an explanatory view of a conventional method of joining plate members.
FIG. 9 is an explanatory view of a conventional method of joining plate members.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rear quarter panel 1a Edge 1b General part 1c Uneven part 1d Concave ridge 1e Convex ridge 2 Roof panel 2a Edge 2b End face 4 Plate member joining part 5 Weld metal

Claims

A plate member formed by an edge portion of another plate member on the stepped portion of one plate member having a general portion and a stepped portion, the edge portion of the other plate member being formed on the stepped portion of the stepped portion, the plate member being formed by the stepped portion and the end surface of the other plate member In the joining method of a plate member for performing build-up welding on the joining portion of
A convex ridge that abuts on the stepped portion to avoid contact with the end surface of the other plate member, and a concave portion that is continuous with the mating portion of the plate member and a back surface that is separated from the end surface of the other plate member. A part is formed, the other plate member is superimposed on the protruding portion, and overlay welding is performed so as to fill the mating portion and the concave portion of the plate member, and further, the welded portion is subjected to finish processing from the surface side by grinding. A method for joining plate members, characterized in that:

2. The method of joining plate members according to claim 1, wherein the build-up welding is performed in a state where the surface of the edge portion of the other plate member is projected and overlapped with the surface of the general portion of the one plate member.

Along the mating portion of the plate member between the end face of the stepped portion and the other plate member of one plate member to form a projection projecting from one plate member, the end surface of the edge portion of the other plate member The method according to claim 1, wherein a projecting portion is formed to project along the edge.

A plate in which the edge of the other plate member is superimposed on one of the plate members bent in a stepped manner, and the welded portion is welded to the joint of the plate member formed by the stepped portion and the end surface of the other plate member. In the connection structure of the members,
The stepped portion avoids contact with the end surface of the other plate member, and a concave ridge portion continuous with the mating portion of the plate member, and on the back surface of the other plate member separated from the end surface of the other plate member. A ridge portion that abuts against the ridge portion, wherein the other ridge portion is overlapped with the ridge portion, and the inside of the mating portion and the concave ridge portion of the plate member is filled and welded to build up. .