B-1 business visa for USA:

The B-1 business visa is a nonimmigrant visa which allows foreign nationals other than students, persons performing skilled or unskilled labor, or representatives of foreign information media, to enter into the U.S. on short notice to attend business meetings or seminars.

Ineligible for business visa:

Anyone seeking to enter the US to perform labor, such as construction workers are not admissible on business visa. Foreign nationals seeking to enter into the U.S. to perform building or construction work, whether on-site or in-plant, are not eligible for classification or admission as B-1 nonimmigrant under section 101(a)(15)(B) of the INA Act.
      
Note: The nonimmigrant otherwise qualified as B-1 nonimmigrant may be issued visas and may enter for the purpose of supervising or training of others engaged in building or construction work, but not for the purpose of actually performing any such building or construction work themselves.

Privileges on B-1 visa:

Other than business activities like attending meetings, conventions, business negotiations, tourism purposes etc., you are also entitled to use the visa for short-term training or a company course provided the sponsoring company from your home country be committed to bearing your expenses.

Limitations of B-1 visa:

The U.S. immigration law strictly restricts B-1 visa holders to seek employment or to work in the U.S. and the visitor is not allowed to start any program of study.

 B-1 Visa is Suitable For:

•     Participants to attend scientific, educational, professional, business, or religious conventions
•     Persons to work on specific projects in the U.S. and paid by a foreign employer
•     Business professionals to participate in commercial transactions (which do not involve gainful employment) such as negotiating contracts and consulting with business associates
•     Persons to undertake independent studies such as feasibility studies, market research or any such activity
•     Persons to attend professional or business conferences, workshops, or seminars
•     Business professionals to explore possibilities to set up a subsidiary of a foreign corporation, or to make investments
•     Personal or domestic servants to come to the U.S. with a U.S. citizen or nonimmigrant employer on B, E, F, H, I, J, L, M, O, P, R, or TN status
•     Technical personnel to install or service equipment pursuant to a contract of sale, or to provide after sales service
•     Business professionals to attend meetings as a member of the Board of Directors of a U.S. corporation
•     Persons to observe business, professional, or vocational activity as long as it does not involve any hands-on activity
•     Professional athletes to compete for tournament money and not for a salary
•     Professionals to conduct business consultations with business associates in the U.S.
•     Purchasing agents of a foreign employer to come to the U.S. to procure goods, components, or raw materials for use outside the U.S.
•     Foreign business persons coming to the U.S. in conjunction with Litigation
•     Persons rendering professional services in the U.S. that would otherwise qualify them for an H-1B visa, but who are paid for those services by a source outside the U.S.
•     Persons employed outside the U.S. who are paid from abroad, and who come to the U.S. to undertake an established training program that would qualify them for an H-3 visa
•     Employees of foreign airlines who are engaged in productive employment in the U.S. and paid in the U.S. who are not eligible for E-1 treaty trader status
•     Other persons such as for bona fide religious missionaries and crew members on yachts
•     Special situations involving Canadians and Mexicans such as Canadian truck drivers who are paid by either Canadian or U.S. firms and who transport commodities across the Canadian Border
•     Foreign companies to send their personnel to the U.S. to install or service equipment pursuant to a contract of sale or to provide after sales service
•     U.S. companies to bring foreign business consultants for training or expert advice
•     U.S. universities to bring foreign guest speakers or lecturers