Patent ID: 11919102
Assignee: ARCELORMITTAL
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A welding method for manufacture of an assembly, the method comprising the following steps:
A. providing at least two metallic substrates including a first metallic substrate being a hardened steel part coated with:
an alloyed coating including zinc and silicon, and optionally magnesium, a balance being aluminum, the alloyed coating being directly topped by
a native oxide layer including ZnO and optionally MgO;

B. applying a spot welding cycle, with a spot welding machine having welding electrodes and a spot welding power source applying an inverter direct current, through the at least two metallic substrates of step A), the spot welding cycle including the following sub-steps:
i. applying one pulsation with a pulsation current through the at least two metallic substrates joined together using welding electrodes connected to the spot welding power source, the one pulsation having a pulsation duration, and directly after,
ii. welding with a welding current applied through the at least two metallic substrates for a welding duration;
wherein the pulsation current is higher than the welding current and wherein the pulsation duration is shorter than the welding duration.