Narrow gap welding is the process by using a relatively narrow slit. This is generally applied to the material that is thick, ie above 50 mm. Generally use the Bevel angle 45 degrees or 60 degrees so that the openings of the Bevel is quite large. This will cause the need for more wire weld and heat received by the metal-based higher. Narrow the gap angle between 10 degrees to 20 degrees. This will reduce the need for wire weld. Generally used for narrow gap SAW welding so with a narrow slit can be reached welders.

Welding with a small gap, between the angle of 10-20 degrees will reduce the heat received by the base metal because welders activity also decreased in the weld joint and can be economically reduction Consumable from welding. high heat received by the Base Metal can cause distortion and changes in the regional Haz metalurgy. for material over 50 mm thick than the narrow gap welding, we can also use the joint preparation with the double-Vee, welders means of two-way (arrow side and other side, provided there is access). double vee joint is also effective to reduce the occurrence of distortion due to welding balance is quite good and also Consumable. but to narrow gap with a small corner of the Bevel, eg 10-20 degrees with over 25.4mm thick material on process SMAW / MMA susceptible of a defect such as slag inclusion and lack of side wall fusion of the wave field in the welding electrode is limited, especially in the difficult position on the welding structure.

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