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    Weld repair process and article repaired thereby
    1.
    发明授权
    Weld repair process and article repaired thereby 失效

    公开(公告)号：US5762727A

    公开(公告)日：1998-06-09

    申请号：US843175

    申请日：1997-04-14

    申请人： Gerald Richard Crawmer ,  John Francis Nolan

    发明人： Gerald Richard Crawmer ,  John Francis Nolan

    IPC分类号： B23P6/00 ,  B23K9/04 ,  B23K9/14 ,  B23K9/16 ,  B23K31/00 ,  B23K35/00 ,  B23K35/30 ,  C21D9/50 ,  B23K31/02

    CPC分类号： B23P6/007 ,  B23K35/004 ,  B23K9/044 ,  B23K9/164 ,  C21D9/50 ,  B23K2201/001 ,  B23K35/3053 ,  Y10T428/12653 ,  Y10T428/12965

    摘要： A method for weld repairing an article formed of a low-alloy steel, such as a steam turbine component. The method generally includes the step of depositing a first weld repair (14) on a surface of the article, during which a hard heat-affected zone (HAZ) (18) having a fine grain size is formed in the article beneath the surface on which the weld repair (14) is deposited. The first weld repair (14) and at least a portion of the HAZ (18) adjacent the first weld repair (14) are then locally heat treated at a temperature above a critical temperature A.sub.1 of the alloy from which the article is formed. As a result of this localized heat treatment, the original grain structures of the first weld repair (14) and the HAZ (18) are entirely replaced with a fine-grain structure with acceptable hardness. Thereafter, at least one additional weld repair layer (16) is deposited on the first weld repair (14). The first weld repair (14) is intentionally formed to have a sufficient thickness to avoid formation of additional HAZ in the surface of the article as the additional weld repair layer (16) is deposited. Without a post-weld heat treatment of the additional weld repair layer (16) or the article as a whole, the method yields a repair weld (12) that exhibits properties that are comparable to and can even exceed that of the base material (10) of the article.

    Fabricating turbine rotors composed of separate components
    6.
    发明授权
    Fabricating turbine rotors composed of separate components 有权

    公开(公告)号：US06454531B1

    公开(公告)日：2002-09-24

    申请号：US09748150

    申请日：2000-12-27

    申请人： Gerald Richard Crawmer

    发明人： Gerald Richard Crawmer

    IPC分类号： F01D102

    CPC分类号： F01D5/28 ,  B23K20/129 ,  B23K2101/001 ,  F01D5/063

    摘要： A steam turbine rotor is constructed from a first forging of a first alloy, and a second forging of a second alloy different than the first alloy. For example, one of the alloys is suitable for use in a high temperature environment and the other in a low temperature environment. The forging ends are contoured so as to provide central portions, which may be disc-shaped, and the contoured portions may be in the shape of truncated cones. A first weld, such as a root weld formed by inertia, friction, or electroslag welding, joins the central portions, and the contoured portions are joined by a second weld different than the first weld, such as a submerged arc weld. This allows the rotor forgings to be joined in relatively inexpensive horizontal facilities, and reduces the demands on the welding technology required to obtain a sound root weld.

    Weld repair process and article repaired thereby
    7.
    发明授权
    Weld repair process and article repaired thereby 失效
    焊接维修过程和文章修复

    公开(公告)号：US6117564A

    公开(公告)日：2000-09-12

    申请号：US47564

    申请日：1998-03-25

    申请人： Gerald Richard Crawmer ,  John Francis Nolan

    发明人： Gerald Richard Crawmer ,  John Francis Nolan

    IPC分类号： B23P6/00 ,  B23K9/04 ,  B23K9/14 ,  B23K9/16 ,  B23K31/00 ,  B23K35/00 ,  B23K35/30 ,  C21D9/50 ,  B32B15/18

    CPC分类号： B23P6/007 ,  B23K35/004 ,  B23K9/044 ,  B23K9/164 ,  C21D9/50 ,  B23K2201/001 ,  B23K35/3053 ,  Y10T428/12653 ,  Y10T428/12965

    摘要： A method for weld repairing an article formed of a low-alloy steel, such as a steam turbine component. The method generally includes the step of depositing a first weld repair (14) on a surface of the article, during which a hard heat-affected zone (HAZ) (18) having a fine grain size is formed in the article beneath the surface on which the weld repair (14) is deposited. The first weld repair (14) and at least a portion of the HAZ (18) adjacent the first weld repair (14) are then locally heat treated at a temperature above a critical temperature A.sub.1 of the alloy from which the article is formed. As a result of this localized heat treatment, the original grain structures of the first weld repair (14) and the HAZ (18) are entirely replaced with a fine-grain structure with acceptable hardness. Thereafter, at least one additional weld repair layer (16) is deposited on the first weld repair (14). The first weld repair (14) is intentionally formed to have a sufficient thickness to avoid formation of additional HAZ in the surface of the article as the additional weld repair layer (16) is deposited. Without a post-weld heat treatment of the additional weld repair layer (16) or the article as a whole, the method yields a repair weld (12) that exhibits properties that are comparable to and can even exceed that of the base material (10) of the article.

    摘要翻译： 一种焊接修补由诸如汽轮机部件的低合金钢形成的制品的方法。 该方法通常包括在制品的表面上沉积第一焊接修复（14）的步骤，在该步骤期间，在物体的下表面上形成具有细粒度的硬热影响区（HAZ）（18） 焊接修复（14）被沉积。 然后在高于形成制品的合金的临界温度A1的温度下对第一焊接修复（14）和与第一焊接修复（14）相邻的HAZ（18）的至少一部分进行局部热处理。 作为这种局部热处理的结果，第一焊接修复（14）和HAZ（18）的原始晶粒结构完全被具有可接受硬度的细晶粒结构替代。 此后，至少一个附加的焊接修复层（16）沉积在第一焊接修复（14）上。 有意地形成第一焊接修复（14）以具有足够的厚度，以避免在附着的焊接修复层（16）沉积时在制品的表面中形成另外的HAZ。 没有对附加焊接修复层（16）或整个制品进行后焊接热处理，该方法产生修复焊缝（12），其具有与基材（10）相当并且甚至可以超过基材 ）的文章。