Abstract:
Die Erfindung betrifft eine Vorrichtung (10) zum Zentrieren, Innenformdrücken, Richten und Spannen von rotationssymmetrischen Hohlkörpern, beispielsweise an einer Flansch-Rohr-Flansch-, Flansch-Rohr- oder Rohr-Rohr-Anordnung, die durch Rührreibschweißen oder Schmelzschweißen im Stumpfstoß verbunden werden, mit einem sich an den Innendurchmesser der Hohlkörper anpassbaren, mittig zur Hohlkörperachse angeordneten Spannkörper (10) mit Antrieb (21). Der Spannkörper (10) ist als Schweißbadsicherung in Form einer Zentrier-, Innenform, Richt- und Spannscheibe ausgebildet, die in kreissegmentförmige Primär- und Sekundärbacken (14,16) mit jeweils daran radial in Richtung Hohlkörperachse angebrachten hammerförmigen Halte- und Gabelelementen (17) aufgeteilt sind, von denen jedes Halte- und Gabelelement (17) in einer Aussparung (35) eines Trägerelementes (36) geführt und durch einen Primär- bzw. Sekundärhebel (18,19) mit einem Stößel (20) des Antriebs (21) kniehebelartig radial schwenkbar verbunden ist.
Abstract:
Die Erfindung betrifft eine Vorrichtung zum Zentrieren, Abstützen und zur Schweißbadsicherung beim Verbinden, insbesondere Rührreibschweißen oder Schmelzschweißen, von Stumpfstößen rotationsymmetrischer Hohlkörper. Der Spannkörper ist als Schweißbadsicherung in Form einer Spann- und Abstützscheibe (10) ausgebildet, die in kreissegmentförmige Primär- und Sekundärbacken (14,16) mit jeweils daran radial in Richtung Hohlkörperachse angebrachten Steg- und Haltelementen (26) aufgeteilt ist, von denen jedes Steg- und Halteelement (26) der Primär- und Sekundärbacke (14,16) in einer Aussparung (27) eines Trägerelementes (28) geführt und einen Steuerbolzen aufweist, der jeweils in eine separate Steuerkulisse einer jeweils den Primärbacken (14) und Sekundärbacken (16) gesondert zugeordneten Primärsteuer- und Sekundärsteuerscheibe zum radialen Führen und Verstellen der Steuerbolzen in die jeweilige Steuerkulisse eingreift, wobei die Primärsteuerscheibe und Sekundärsteuerscheibe mit einer Steuerwelle verbunden ist, die zum Hin- und Herschwenken der Primärsteuerscheibe und der Sekundärsteuerscheine zwischen einem Spann- und Entspannzustand der Primär- und Sekundärbacken (14,16) mit einem Schwenkantrieb in Verbindung steht.
Abstract:
A method of joining pipes (3) to produce an underwater pipeline (2) provides for rotating an extrusion outlet about a cutback (18) between two welded pipes (3) so as to wind and simultaneously extrude a protective sheet (22) about the cutback (18) from the extrusion outlet (38) close to and facing the cutback (18); and compressing the protective sheet (22) on the cutback (18) downstream from the extrusion outlet (38).
Abstract:
Provided is a submerged arc welding method for a steel plate which is preferably used in making and welding a large diameter pipe such as a UOE steel pipe or a spiral steel pipe. As specific means, in welding the steel plate from an internal surface or an external surface by a submerged arc welding, welding condition is set such that, a cross-sectional area of internal weld metal S 1 and a cross-sectional area of external weld metal S 2 satisfy the formula (1), the formula (2), and the formula (3), that is, 0.40≤(S1+S2)/t 2 ≤0.80 ...... (1), S 1 /t 2 ≤0.35 ...... (2), and S 2 /t 2 ≤0.45 ...... (3), wherein t: a plate thickness of the steel plate (mm), S 1 : a cross-sectional area of the internal weld metal (mm 2 ) excluding the cross-sectional area of a portion of the internal weld metal overlapping with the external weld metal after external welding, and S 2 : a cross-sectional area of the external weld metal (mm 2 ).
Abstract translation:提供一种用于钢板的埋弧焊接方法,其优选用于制造和焊接诸如UOE钢管或螺旋钢管的大直径管。 作为具体的方法,在通过埋弧焊接从内表面或外表面焊接钢板的情况下,设定焊接条件,使得内部焊接金属S 1的横截面积和外部焊接部的横截面积 金属S 2满足公式(1),公式(2)和公式(3),即0.40‰(S1 + S2)/ t 2‰¤0.80......(1) S 1 / t 2‰¤0.35...(2),S 2 / t 2‰¤0.45......(3)其中t:钢板厚度(mm) ,S 1:外部焊接后的与外部焊接金属重叠的内部焊接金属的一部分的截面积以外的内部焊接金属(mm 2)的截面积,S 2:横截面积 外部焊接金属的面积(mm 2)。
Abstract:
The invention relates to an apparatus and method for coating a pipe (20) or a section of a pipe (20) with a polymer layer (26). The apparatus comprises an applicator (22) for applying polymer melt on the surface of a pipe or pipe section, a roller (24) for pressing the polymer applied by the applicator towards the pipe or pipe section, and means for circumferentially moving the applicator and the roller around the periphery of the pipe or pipe section. According to the invention the apparatus further comprises a drive for rotating the roller as the roller is moving around the periphery of a pipe or pipe section. By means of the invention, higher quality coatings can be applied to field joints of steel pipes, for example.
Abstract:
This invention relates to a welded line pipe structure for transporting corrosive petroleum or natural gas. It is constituted by martensitic stainless steel pipes containing 8 - 16% Cr and at most 0.05% C. By suitably controlling the welding conditions at the time of girth welding of the steel pipes so as to ensure that the Cr concentration in grain boundary Cr-depleted portions existing immediately beneath a weld oxide scale is at least 5%, the occurrence of SCC in a high temperature CO 2 environment can be prevented.
Abstract:
The present invention relates to a method and apparatus for welding pipes together. Two pipes (102, 104) are arranged end to end, the pipes being shaped such that a groove (106) is defined between the ends of the pipe. A plurality of welding torches (503) are used to weld in the groove, such that at least some of the welding torches perform a first welding pass, the welding characteristics of the torches are adjusted and at least some of the welding torches are used to perform a second welding pass. At least one torch welds in a first sector in the first welding pass and a second sector in the second welding pass, the second sector being different to the first. The sectors might overlap or might not overlap.
Abstract:
The present application describes a peening device useful for peening regions of annular welds (6) inside submarine pipes, comprising at least one peening tool (5), said device comprising at least one hammer actuated so as undergo reciprocating radial peening translations against the internal surface of the pipe (2i) and/or of said weld (6), in which said peening tool (5) comprises a single hammer, and said hammer is pivotally mounted so as to be able to vary its angle of inclination to the surface to be peened, and said device includes a carriage (3) capable of moving in axial longitudinal translation (XX) inside a pipe and supporting means (4a, 4b) for moving said peening tool (5) in longitudinal and radial translation and in rotation relative to said carriage (3); and said hammer cooperates with actuating means undergoing reciprocating radial peening translations, by the use of electromagnetic energy and reciprocating movement inside a solenoid coil preferably furthermore cooperating with a spring.
Abstract:
Provided is a wire rod for an I-type oil ring, which includes right and left rail portions and a web portion connecting the rail portions, which has an oil hole or a molten through hole formed in the web portion, and which has a circumscribing circle diameter of 10 mm or less in its transverse contour. The molten through hole has such a remolten portion formed on its exit side as encloses the exit of the molten through hole. The remolten portion exceeds such a molten portion in the transverse section along the center of the molten through hole as is formed in the molten through hole, and is formed to have 200 µm or less from the outer circumference of the molten through hole and 100 µm or less in the depth direction of the molten through hole.
Abstract:
The present invention provides a method of production of electric resistance welded steel pipe able to stably reduce weld defects due to oxides by firing plasma and furthermore able to reduce plasma jet noise and comprises shaping steel plate 1 into a tube and electric resistance welding the abutting end faces 4 during which blowing on at least the abutting end faces 4a in the region 6 at the welding upstream side from the weld point 9 where the temperature becomes 650°C or more a reducing high temperature (pseudo) laminar plasma obtained by applying voltage to a reducing gas containing H 2 gas: 2 to 50 vol% to which is added a balance of Ar gas alone or a mixed gas of Ar gas to which N 2 gas, He gas, or both are added. At that time, it is preferable to make the applied voltage over 120V and the make the plasma blowing conditions satisfy the following formula (1). "> 150 4 × ∑ G i M i π × D × μ ave , T = 7000 400
Abstract translation:本发明提供了生产电阻焊钢管能够稳定地减少焊接缺陷的方法由于通过烧成等离子体,进一步能够减少等离子体喷射噪声并且包括成形钢板1为管和电阻焊接对接端氧化物 在此期间,在焊接上游侧从焊接点9中,其中的温度变为650℃以上的还原性高温(准)层流等离子体通过将电压施加到获得吹至少在对接端面4a中,该区域6面4 含H 2个气还原气体:2〜50%(体积),向其中加入单独Ar气的平衡或Ar气的混合气体为N 2的气体,He气体,或两者都添加。 在时刻那样,优选的是,使在120V的施加电压和使等离子体吹塑条件满足下式(1)。 150 <4דG I M I A×D×¼AVE,T = 7000 <400