Ask professionals to tell us: What are the differences between fitters, riveters, welders and plumbers in construction projects, and what are their specific jobs? Thank you.

The fitter is specifically responsible for drilling and equipment positioning of the drilling machine. The most important of these jobs is responsible for the lofting, blanking, assembly and installation of workpieces. This type of work is directly related to the quality and progress of the whole project, and of course the requirements for employees are relatively higher. Welders are responsible for welding operations between workpieces, including tailor welding, gas shielded welding, submerged arc welding and argon arc welding. For jobs with high welding requirements, the quality requirements for welders are relatively high; The plumber's job is mainly during the pipeline construction, and the calculation, blanking and collision of the pipeline are second only to riveting. These are some personal opinions. I wonder if they are correct. Please correct me.