Plastic parts are welded with a true 3D volumetric weld using intersecting multi-beam trace laser welding in which a plurality of spot laser beams having the same wavelength are directed to the so that the laser beams intersect each other at a point along a weld path within one of the plastic parts at an angle in an intersection angle range between ten degrees and ninety degrees. The plurality of laser beams are traced so that the intersection of the plurality of laser beams traces along the weld path to form a weld pattern that is linear, curvilinear, planar or three dimensional along a joint that is inside a volume of plastic. The plastic part in which the laser beams intersect is partially absorptive to laser light at a wavelength and the laser beams have this wavelength.

This invention describes a 3-layer insulation material (10) comprising a first fabric layer (12), a second fabric layer (14) and a third fluted intermediate fabric layer (16) between the first and the second fabric layers (12, 14), the fluted intermediate fabric layer (16) being attached alternately to the first and the second fabric layer (12, 14) with longitudinal seams (18a-18n) forming longitudinal channels (20a-20n) for the insulation material (22) having individual insulation material (22) bundle in-side each longitudinal channel (20a-20n). Also disclosed are a method and an arrangement for producing the same.

A waveguide segment with two sub-segments including a first sub-segment with a first wall and a second wall, each having an inner face by which laser light can be reflected. The inner faces are opposite to each other and a depth of the sub-segment is defined by a distance between the first and the second inner face. Further, each wall has an exit side, and an opposite entry side, a height defined by the distance between the exit and the entry side and a width. At least part of the entry side of each wall extends in an angle to the height, for which applies: 0<<90. The second sub-segment may be formed complementary and the second sub-segment has a portion at the exit side of each wall. Laser light passing through the second sub-segment enters the first sub-segment between the first and the second portion.

A laser-welded body includes at least three of resin members, which contain a thermoplastic resin including: a first resin member which is a laser-irradiated subject, has an absorbance a.sub.1 of 0.01 to 0.12; a second resin member which has an absorbance a.sub.2 of 0.1 to 0.9 and includes a butted part where ends of one or more resin members are brought into contact with each other; and a third resin member which has an absorbance a.sub.3 of 0.2 to 3.8, and the absorbances a.sub.2, a.sub.3 exhibited by the second resin member and the third resin member are attributed to the inclusion of nigrosine as a laser beam absorbent therein, and the resin members are overlapped in the above mentioned to form contacted parts at these interfaces, at least a part of the butted part and/or the contacted parts are laser-welded.

The present invention relates to a method for welding two polyamide plastics using a primer, the primer containing at least one polymer synthesized from at least one maleic anhydride or maleic anhydride derivative. The invention also relates to correspondingly welded products.

Disclosed is a method for welding a polyolefin plastic and a plastic based on at least one polymer containing carbonyl groups, using a primer which contains, in relation to the proportion of polymer, at least 20 wt. % of a polymer that comprises maleic anhydride or maleic anhydride derivative units. Also disclosed are correspondingly welded products.

A water passing component, a laser welding device and a welding method thereof are presented. The water passing component comprises a hose and a hose joint, the hose joint and the hose matched and connected to form a connecting and matching position. The connecting and matching position can be melted under laser beams to weld the hose and the hose joint into a whole; the width of a gap of a weld matching surface corresponding to the connecting and matching position is less than 0.075 mm. The present invention melts the connecting and matching position using the laser welding technology to weld the hose and the hose joint into a whole. The transparency of the hose and the hose joint is not limited, and there is no requirement for the transparency of the hose and the hose joint, thereby reducing production cost, increasing production efficiency and expanding use.

A waveguide for plastic welding has an entry end, an exit end as well as a first and a second inner face arranged between the entry end and the exit end, which are arranged opposite to each other and by means of which laser light can be reflected. A first distance between the entry end and the exit end defines a length of the waveguide and a second distance between the first and the second inner face defines a thickness of the waveguide. The exit end may be arranged opposite to the entry end and a central plane of the waveguide may extend centrally from the entry end to the exit end. The first inner face comprises a continuously curved, concave shape so that a third distance between the first inner face and the central plane varies continuously from the entry end in the direction of the exit end.

A method for joining two components of a meltable material comprises the steps of providing a first component having a first border region and a second component having a second border region, placing the second component relative to the first component so as to form an overlap between the first border region and the second border region under a gap between the first border region and the second border region, continuously heating opposed sections of the first border region and the second border region at the same time through at least one energy source arranged in the gap at least partially, continuously providing a relative motion of the at least one energy source along the first border region and the second border region in the gap, and continuously pressing already heated sections of the first border region and the second border region onto each other.

A method and installation for joining a cover layer to an object in a continuous process. Joining is effected with the aid of a joining material having thermoplastic properties, wherein the joining material is arranged between the cover layer and the object and is liquefied using ultrasonic vibration energy. Before application of the ultrasonic vibration energy, the joining material is preheated in a contactless manner with the aid of electromagnetic induction in the region of the glass transition temperature of the joining material or above this glass transition temperature. The object is in particular a chip board and the cover layer an edge strip to be joined to an edge of the chip board.