Patent ID: 7238769

Claim:
A method for joining liquid-crystalline polyester resin composition parts, characterized in that the melting point of the liquid crystalline polyester resin measured by differential scanning calorimeter is 190-250° C., the resin consisting essentially of the repeating units represented by the following formulae (I), (II), (III) and (IV): wherein: Ar 1 and Ar 2 each represents at least one bivalent aromatic group; and p, q, r and s represent relative molar proportions (mol %) of the repeating units in the liquid-crystalline polyester resin and satisfy the following formulae: 0.4≦p/g≦2.0 2 mol %≦r≦15 mol % 2 mol %≦s≦15 mol %, and that the parts are jointed by means of welding.