Original:  The paper reported that welders for KFM, the company under contract to build the bridge, told authorities that they were pressured and even paid monthly bonuses of between $200 and $600 for performing substandard welds on the support piers for the bridge if it meant the project proceeded faster.
Revised:  The paper reported that welders for KFM, the company under contract to build the bridge, told authorities they were pressured and even paid monthly bonuses of between $200 and $600 for performing substandard welds on the support piers for the bridge if it meant the project proceeded faster.
Edit intent: coherence