Na verdade é a configuração de soldagem ou de conexão dos pinos do relé:
soldering (settings) connection /// configuration (settings)

Electrical connector having reliable soldering configuration - Google
www.google.com/patents/US20030232523 - Traduzir esta página
An electrical connector (1) for electrically connecting a central processing unit (CPU) with a printed circuit board (PCB) (5) includes an insulative base (2), ...

O contexto puramente técnico - Transporte e Construção de Eslaleiros - refere-se ao serviço de soldagem em relés. Portanto, o termo técnico para soldagem é 'welding'. Vale uma consulta ao Dicionário técnico de Luiz Mendes Antas (não disponível online).

Refers to the relay going south in conjunction with other unplanned events.

As referred to in

movable guards are closed and also the welding status
of contacts for mirror contact-type magnetic contactors.
In the case of occurring abnormalities such as contacts
welding, for example, the output contacts 23-24
and 33-34 are turned off, and control is implemented
to inhibit the motor from starting.

http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd...

There was some discussion whether the relay would weld upon opening. Steve quoted Siemens: "[welding occurs upon] opening and immediate reclosing of contacts". If you want to weld the contact this is definitely the way to do it. Opening will probably draw an arc, and reclosing it during this arc means that there's current during the high resistance phase at the first contact. Contact + high energy = high risk of welding. Even if the arc already extinguished the air in the gap may still be ionized, meaning that it may ...

http://electronics.stackexchange.com/questions/16581/how-do-...