What is field weld in construction?

In the shop the work rotates to the flat position, the welder stands at a bench, and conditions are controlled. In the field the same weld is often vertical or overhead, reached from a lift or staging, and exposed to wind, cold, and moisture that force preheat and weather protection. Add field inspection access and slower fit-up, and a multiplier of three to five times the shop cost is a normal planning assumption, not pessimism.

Look for the flag at the bend of the weld symbol, where the arrow meets the reference line; that flag is the only thing separating a shop weld from a field weld. Check the erection drawings, connection details, column splice details, and the typical notes, because a flag in a typical detail applies across many locations. If a flagged detail calls for a CJP groove weld, plan on field ultrasonic testing as well.

On negotiated or design assist work, yes. Bolted connections erect faster, are less weather sensitive, and need only visual and pretension inspection instead of UT, so swapping field welded moment connections for bolted end plate or flange plate connections is one of the most reliable structural value engineering moves. On hard bid work you price what is drawn, but flagging the bolted alternative in your proposal can help win the job.