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<br />K. Ambient temperatures for seaming should be above freezing (i.e. thirty- <br />t~vo degrees Fahrenheit). However, seam welding below thirty-two <br />degrees Fahrenheit can be accomplished as stated in Item L. <br />L. For cold weather seaming, it may be advisable to preheat the sheets with a <br />hot air blower, to use a shield of some sort to prevent heat losses during <br />seaming, and to make numerous test welds in order to determine <br />appropriate seaming conditions (e.g. equipment temperatures should be set <br />higher and seaming rates slowed down during cold weather seaming). <br />II. Equipment Preparation <br />A. A working and properly functioning small electric generator must be <br />available within close proximity' of the seaming area and with adequate <br />extension cords to complete the entire seam. The generator must be <br />rubber tired, or placed on a smooth plate such that it is completely stable <br />so no damage can occur to the FML. Fuel (gasoline or diesel) for the <br />generator must be stored off the FML. <br />B. ,~ hot wedge seaming device is a completely self contained system know <br />as a ~~hot shoe". <br />C. As the hot wedge method is one of melting the opposing surfaces or the <br />tw'o Fv[Ls to be joined, no grinding of sheets is necessary, nor allowed. <br />D. Tacking of the FAIL sheets as done in ertrudate fillet seaming is not <br />necessary. <br />E. The hot wedge itself, or "anvil", should be inspected to see that it is <br />uniform and reasonably tapered. Various types aze currently available. <br />Some aze smooth surfaced while others have patterned ridges in the <br />direction of the seam. The taper dimensions vary according to different <br />types of machines. The major point for inspection is that no sharp edges <br />should exist where FIvIL sheet surfaces must pass. <br />F. Knurled rollers for applying pressure on the sheets and driving the device, <br />follow the wedge. They should be inspected for sharp surfaces. <br />G. If a dual, split hot wedge seam is being made, the recessed space for the <br />air track should be examined. See the following sketches: <br />as <br />