Abstract
It is examined whether an extrapolation method can presume temperature in faying surface of high density polyethylene round bar because this material is very small heat conductivity and low melting point. As a result of this examination, it is possible that this method is used for measurement of temperature. Therefore, this study have used this method, and the effect of friction welding condition on temperature distribution in faying surface of polyethylene is investigated with a brake type friction welding machine which was built as a trial for polyethylene.
The experimental results are as follows;
1) When installation location of thermocouple was below 0.5mm interval, the extrapolation method can presume temperature distribution in faying surface.
2) When friction pressure was P1=0.10MPa, the temperature distribution in faying surface was almost the same (about 452–497K).
3) When friction pressure was P1=0.25MPa, the temperature of middle (about 639K) and outside part (about 646K) was very high in spite of one of center part (about 387K) was low and not melted. Therefore, this temperature distribution was not uniformity.
4) The error of installation location of 0.1mm of thermocouple has occurred to measured error of about 5% because axial temperature gradient was steep. Therefore, this material was required sufficient care, when temperature in faying surface was measured by this method.
