The aim of this study is to identify tasks that involve risky work postures by using the ergonomic risk assessment methods such as REBA, OWAS, QEC, and MANTRA in a tube manufacturing plant which is regarded as heavy and dangerous workgroup. Different from other studies, in this study; the risk assessments of the production stages (tasks) and body parts were made, separately. Firstly, these four methods have been prioritized by the AHP method so that an integrated assessment could be carried out. Five criteria were used in the AHP process. They are intelligibility, availability, duration, input data and output data. Later, the duties of the workers and the duties which causes working hard were determined and the risk categories of these duties were evaluated with REBA, OWAS, QEC and MANTRA methods. Finally, obtained using the priorities obtained from the AHP method was used to get an integrated result. According to the results, the most risky tasks are identified as the creation of the lower part of the tube and the hanging of small tubes, while the most forced body parts in these tasks are the wrist and ridge. As a priority, these work and work stations zshould be arranged for these tasks and body parts in an ergonomic manner and the working postures should be adjusted, accordingly.