Adhering sealing member to metal with weld heat
A method of securing a sealing washer to one surface of a metal sheet while welding a head of a fastener to a second surface of a metal sheet, the method comprising: compressing the head onto the second surface of the sheet between a first electrode engaging the head and a second electrode engaging the first surface of the sheet, welding the head to the second surface of the sheet by electrical resistance welding to heat the first surface of the sheet proximate to the first electrode, urging a sealing washer into the heated first surface with the second electrode to heat the sealing washer and thereby bond the sealing washer to the first surface.
1. A method of securing a sealing washer to one surface of a metal sheet while bonding a fastener to another surface of a metal sheet;
the method comprising:
providing a sealing washer which when engaged with a heated surface bonds to such surface,
providing a metal sheet having an opening therethrough,
providing a fastener having a head,
bonding the head of the fastener to a first surface of the metal sheet about the opening by a process which to achieve such bonding heats a second surface of the metal sheet proximate to the fastener about the opening,
urging the sealing washer onto the second surface about the opening while still heated from the fastener bonding step thus heating the sealing washer and thereby bonding the sealing washer to the second surface about the opening,
wherein the sealing washer is urged into the heated second surface while the sealing member is held in a washer holder having a face with a socket extending into the holder from the face and adapted to receive the washer therein for urging the washer into contact with the second surface,
wherein the socket extends into the holder to a socket end,
a piston is slidably disposed within the socket,
a washer reception space is provided in the socket outwardly from the piston,
the piston is biased outwardly from the socket and thereby urges the washer onto the second surface.
2. A method as claimed in claim 1 wherein the piston is movable between a retracted inner position and an outer position,
in the retracted inner position, the washer reception space is provided in the socket between the piston and the face of sufficient depth to receive the washer fully within the socket and spaced inwardly from the face,
in movement of the piston towards the outer position, the piston urges the washer onto the second surface.
3. A method as claimed in claim 1 including a mechanism to move the piston between the inner and outer positions and control the timing of when the piston urges the washer into the second surface relative to when the first surface is heated.
4. A method as claimed in claim 3 wherein the mechanism comprises a pneumatic mechanism.