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US4896812A
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Double downhill pipe welder
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US4857690A
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Cassette welding head apparatus
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US4810848A
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Tube welder
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US4726300A
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Adjustable spring-biased track assembly for mounting a welding head assembly on a pipe
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US4703698A
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Track mounted welding head base having cam pivoted drive assembly
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US4649250A
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Pipe welder
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US4554429A
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Cylindrical tube welding assembly
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US4556774A
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Welding apparatus for welding tubes to the back face of a tube sheet
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US4476367A
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Front face tube to tube sheet welding apparatus
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US4538046A
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Precise positioning for a welding electrode which follows a three dimensional weld path
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US4427868A
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Mounting fixture for an automatic welding apparatus
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US4408112A
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Welding insert ring and method of welding therefor
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US4379963A
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Welding apparatus designed particularly for use within a confined area
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US4365132A
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Welding apparatus for polygonal cross-sectioned tubing
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US3688069A
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Welding head apparatus
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