Around 200 workers at a Wrexham cable factory walked out for six hours over the course of yesterday and this morning in a strike over pay.
Employees at Prysmian Cables on Wrexham Industrial Estate held a picket line outside the factory carrying union flags.
The pay row broke out after workers rejected a 1.5% pay increase voting 94.7% in favour of strike action.
Unite union bosses and workers at the local factory complained that the proposed increase was well below the rate of inflation and did not reflect the large profits made by the company last year.
Approximately 100 Prysmian staff first went on strike at 1pm with another 100 night shift workers striking in the early hours of this morning at 1am.
There are two further walk outs scheduled for Monday with 200 workers expected to take part again.
A spokesperson for Prysmian claimed that the company had tried to resolve the dispute by holding discussions with the union, but that they had decided to go ahead with strike action.