beim

Contraction of bei dem: at the, by the, etc. (followed by a masculine or neuter singular noun in the dative case)

Löten

gerund of löten; soldering

verbinden

1. to join, to combine, to connect
2. to bandage
3. to put through

sich

1. Reflexive pronoun of the third person singular: herself, himself, itself, oneself (direct or indirect object)
2. Reflexive pronoun of the third person plural: themselves (direct or indirect object)

zwei

two (numerical value represented by the Arabic numeral 2; or describing a set with two components)

Metalle

nominative/accusative/genitive plural of Metall