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US3015017A
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Method and apparatus for welding thick-walled tubing and other metal portions
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GB877710A
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Welding of opposed edges of pairs of metal portions
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Method of welding metal elements
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US3015018A
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Heating apparatus
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GB882568A
|
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Methods and apparatus for induction heating butt welding
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GB882256A
|
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Improvements relating to the manufacture of copper tubing
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GB881091A
|
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Lapped welding of metal portions
|
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GB888242A
|
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Improvements relating to the welding of metal portions to one another
|
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US2922020A
|
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Method and apparatus for forming lap welded tubing
|
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US2922019A
|
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Welding of lengths of tubing
|
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US2960593A
|
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High frequency electrical heating apparatus
|
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US2904668A
|
|
Welding of metal strips and tubing
|
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GB869337A
|
|
Improvements relating to high-frequency seam welding
|
|
GB869336A
|
|
Improvements relating to high-frequency seam welding
|
|
GB869938A
|
|
High-frequency electrical welding
|
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US2886691A
|
|
Lapped welding of metal edge portions
|
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US2892914A
|
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Methods and apparatus for butt welding
|
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GB854062A
|
|
Improvements relating to tube or cable sheath welding
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US2919343A
|
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Welding of strips
|
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US2919342A
|
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Welding of strip ends and the like
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