Methods for manufacturing tubes filled with powdery and granular substances
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United States of America Patent
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Mar 9, 1993
Grant Date -
N/A
app pub date -
Feb 21, 1992
filing date -
Jun 21, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of manufacturing tubes filled with powdery and/or granular substances, such as flux-cored welding wires. A tube filled with a powdery and/or granular substance is continuously manufactured by forming a metal strip being fed in its longitudinal direction into an unwelded tube (1a) using forming rolls (2), feeding a powdery and/or granular substance (F) into the unwelded tube (1a) being formed through its opening, butt-welding together fringing edges of the opening, and reducing the diameter of the welded tube (1b). An allowable minimum heat input below which cold cracking occurs and a maximum allowable heat input above which spatters whose diameter is not smaller than 0.83 times the inside diameter of the finished tube are generated are determined in advance, and the butt welding is performed with a heat input larger than the allowable minimum heat input and smaller than the allowable maximum heat input. This eliminates the risk of breaking in reducing the diameter of the welded tube (1b) filled with the powdery and/or granular substance (F).
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