A welding device for applying weld material between two work pieces (P1, P2) so as to connect the work pieces (P1, P2) mechanically with one another, the welding device comprising: a welding head configured to perform a welding action in respect of the work pieces (P1, P2) during transport of the welding device along an operating direction (OD) in a welding plane (WP), and a probe head arranged upstream of the welding head relative to the operating direction (OD), the probe head being configured to measure a set of geometric properties of a gap (G) between the work pieces (P1, P2) so as to enable positioning of the welding head to attain a desired application of the weld material in the gap (G), wherein the welding device comprises first adjustment means configured to allow a position of the probe head to be varied angularly relative to a position of the welding head by rotating at least one of the probe head and the welding head around a first axis (A1) oriented essentially perpendicular to the welding plane (WP), characterized in that the first adjustment means comprises a joint and control means, wherein the first axis (A1) passes through the joint , the control means includes a rod and interconnecting respective flexible attachment points on the welding head and the probe head , wherein the control means further comprises locking bolts arranged on the rod and being manually controllable via a suitable tool to enable the distance between the probe head and the welding head to be fixed, and thereby-to lock the probe head relative to the welding head at a particular angle (α1) with respect to the first axis (A1), or the control means further comprises an electric motor arranged on the rod and configured to rotate the rod , in response to a master signal (S m ), the master signal (S m ) being based on the measured set of geometric properties of the gap (G), wherein rotation of the rod varies the first angle (α1) of the first adjustment means . a welding head configured to perform a welding action in respect of the work pieces (P1, P2) during transport of the welding device along an operating direction (OD) in a welding plane (WP), and a probe head arranged upstream of the welding head relative to the operating direction (OD), the probe head being configured to measure a set of geometric properties of a gap (G) between the work pieces (P1, P2) so as to enable positioning of the welding head to attain a desired application of the weld material in the gap (G), wherein the welding device comprises first adjustment means configured to allow a position of the probe head to be varied angularly relative to a position of the welding head by rotating at least one of the probe head and the welding head around a first axis (A1) oriented essentially perpendicular to the welding plane (WP), characterized in that the first adjustment means comprises a joint and control means, wherein the first axis (A1) passes through the joint , the control means includes a rod and interconnecting respective flexible attachment points on the welding head and the probe head , wherein the control means further comprises locking bolts arranged on the rod and being manually controllable via a suitable tool to enable the distance between the probe head and the welding head to be fixed, and thereby-to lock the probe head relative to the welding head at a particular angle (α1) with respect to the first axis (A1), or the control means further comprises an electric motor arranged on the rod and configured to rotate the rod , in response to a master signal (S m ), the master signal (S m ) being based on the measured set of geometric properties of the gap (G), wherein rotation of the rod varies the first angle (α1) of the first adjustment means . <EOS>