摘要:
The present disclosure inhibits liquid metal embrittlement (LME) cracking and improves corrosion resistance in a welded joint obtained by spot welding a first steel sheet and a second steel sheet. In the welded joint of the present disclosure, a first plating layer is provided on a surface of the first steel sheet facing the second steel sheet, no plating layer is present on or a second plating layer is provided on a surface of the second steel sheet facing the first steel sheet, a boundary plating layer is provided between the first steel sheet and the second steel sheet in a range of 0.5 mm from an end part of the corona bond of the spot welded part toward an outside of the spot welded part, and a Zn penetrated part is present at least at one of the first steel sheet and the second steel sheet adjoining the boundary plating layer. The Zn penetrated part advances from the boundary plating layer along the steel grain boundary, an Mg concentration at a front end of the Zn penetrated part at a location where a Zn concentration is 0.1 mass% is 0.20 mass% or less, and the first plating layer and the second plating layer satisfy a predetermined Relation I.
摘要:
Method for joining of at least two unweldable materials, non-weldable directly to each other with thermal joining processes in a lap joint configuration, where a two step sequence is used consisting of a first step to apply a thermomechanical or mechanical surface protection layer on the surface of an unweldable material and a second step, where a thermal joining process is used to joint the sprayed layer with an applied layer sheet.
摘要:
Die Erfindung betrifft ein Verfahren zur Bestimmung der maximalen Zugkraft einer Verbindung von gefügten Blechen aus einer Materialgüte in Abhängigkeit von der Blechdicke t und des Schweißpunktdurchmessers dp zur Bereitstellung von maximalen Traglastwerten für gefügte Bauteilverbindungen. Die Aufgabe, ein Verfahren zur Bestimmung der maximalen Traglast für Blechverbindungen von Blechen aus einer Materialgüte in Abhängigkeit von der Blechdicke t und des Schweißpunktdurchmessers dp zur Verfügung zu stellen, so dass eine einfache Auswahl an Blechdicken, Materialgüten und Schweißpunktdurchmessern getroffen werden kann, um die vorbestimmte Anforderungen an die Schweißpunktverbindung zu erfüllen, wird durch ein gattungsgemäßes Verfahren gelöst, bei welchem aus Kopfzug- oder Scherzugdaten von Blechverbindungen mit verschiedenen Schweißpunktdurchmessern unter Verwendung einer linearen Regression der Kopfzug- oder Scherzugmessdaten von mindestens zwei verschiedenen Blechdicken t i und t i +1 , welche der oberen und der unteren Grenze des Blechdickenintervalls ( t i , t i +1 ) entsprechen, eine gemeinsame Funktion für die maximale Traglast G ( dp,t ) bestimmt wird, welche für ein Blechdickenintervall ( t i ,t i +1 ) und eine Materialgüte gilt und die Form hat: G dp t = a ⋅ dp + b ⋅ t + c , wobei a, b und c von dp oder t unabhängige Variablen sind.
摘要:
The invention relates to a domestic appliance, in particular, an oven, comprising at least two wall parts (16, 18) of the muffle, fixed together by means of a welded joint (34) and may concern a first tubular and a second wall piece in the form of a back wall of the oven muffle. According to the invention, a long-lasting and robust connection of the wall pieces to each other may be achieved, wherein the welded joint (34) extends through at least one of the wall pieces (18).
摘要:
In a series spot welding method, spherical leading edge portions (26a,27a) of pressed electrode tips (26,27) crush bearing surfaces (30a) that are one stage higher than a general portion (35). Thereby, the bearing surfaces (30a) are first deformed into a spherical shape. The bearing surfaces (30a) thus deformed into the spherical shape are then brought into spot contact with a second steel plate (Wb). Thus, the bearing surfaces (30a) thus deformed into the spherical shape form a conduction path narrowed down to a spot, between a first steel plate (Wa) and the secong steel plate (Wb). Therefore, the density of welding current flowing through the conduction path can be enhanced, and a nugget of sufficient size can be created between the first and second steel plates (Wa,Wb).
摘要:
A spot welding machine comprising a first electrode (7) and a second electrode (8) opposed to the first electrode, whereby a workpiece, including, e.g., a conductor wire coated with a heat-resistant resin film and a terminal to be welded to the conductor wire, is subjected to electric-resistance welding in a manner such that the workpiece is held between the first and second electrodes. In the spot welding machine according to the present invention, a third electrode (9) is interposed between the first electrode and the workpiece so that one distal-end side face of the third electrode abuts closely against a workpiece engaging end of the first electrode, and that the other distal-end side face of the third electrode is in contact with the workpiece. The proximal end of the first electrode is connected to a first terminal of AC power source means (20),and the respective proximal ends of the second and third electrodes are connected to a second terminal. The AC power source means supplies a current, used to heat the third electrode and remove the resin coating film by fusion, to a closed circuit having a route essentially passing through the first terminal, first electrode, third electrode, and second terminal, during a predetermined period. After the removal of the coating film, the aC power source means supplies a current, used to weld the workpiece, to a closed circuit having a route essentially passing through the first terminal, first electrode, third electrode or workpiece and second electrode, and second terminal.
摘要:
Bei einer Vorrichtung zum Widerstandsschweißen mit zwei gegenüberliegenden, unter Krafteinwirkung aufeinander zu bewegbaren Elektroden (10,11), die jeweils von Strom durchflossenen Elektrodenträgern (13,14) gehalten sind, wirkt zwischen den Elektrodenträgern (13,14) infolge des Schweißstroms eine elektromagnetische Kraft (Fe2). Erfindungsgemäß wird diese elektromagnetische Kraft zur Anhebung der Elektrodenkraft (F) genutzt, indem die voneinander weg gerichtete Bewegung der Elektrodenträger (13,14) infolge der elektromagnetischen Kraft (Fe2) in eine aufeinander zu gerichtete Bewegung der Elektroden (10,11) umgesetzt wird. Da die elektromagnetische Kraft nur wirkt, wenn der Schweißstrom fließt, ist eine übermäßige Elektrodenkraft, die druckempfindliche zu verschweißende Bauteile vor dem Schweißvorgang beschädigen kann, vermieden und während des Schweißvorganges eine Nachführung der Elektroden und deren sicherer Kontakt mit den zu verschweißenden Bauteilen gewährleistet.