An electro-chemical module has a porous plate-shaped metallic carrier substrate with a gas-permeable central region and a peripheral region. A layered construction is disposed in the central region on a first side of the carrier substrate. At least one metallic gas-tight housing part is by way of a welded connection connected to the peripheral region of the carrier substrate. A gas-tight zone extends from the layered construction up to the housing part. The gas-tight zone has a gas-tight surface portion which extends superficially from the layered construction on the first side of the carrier substrate at least up to the welded connection. The welded connection by which the gas-tight surface portion is connected in a gas-tight manner to the housing part and the welding zone of which extends only through part of the thickness of the carrier substrate.