Automatic welding without filler-metal additions, also known as Automatic welding, is a type of welding process in which two pieces of metal are joined together without the use of filler metal. This process is typically used for welding similar metals with high melting points, such as stainless steel or nickel alloys.
According to API 1104, Automatic welding without filler-metal additions is allowed under certain conditions. The base materials must be of the same composition and the joint design must be suitable for autogenous welding. In addition, the weld must be inspected and tested to ensure that it meets the required quality standards.
There are several advantages to using Automatic welding without filler-metal additions. It can be a faster and more efficient process, as it eliminates the need to prepare and add filler metal. It can also result in a stronger weld, as there is less opportunity for defects to form due to the lack of a filler metal.
However, there are also some limitations to this process. It is generally not suitable for welding dissimilar metals or for welding metals with low melting points. It may also be more difficult to achieve the desired weld geometry and mechanical properties using Automatic welding without filler-metal additions.
The article is based on following document, we attached reference document also.
When performing Automatic welding without filler-metal additions according to API 1104, a written welding procedure specification (WPS) must be followed to ensure that the weld is made in a consistent and controlled manner. The WPS should specify the following:
- Base materials: The base materials being welded, including the material specification and any required preheat and post-weld heat treatment procedures.
- Welding process: The welding process to be used, including the type of power source and any necessary equipment.
- Welding procedure: The steps to be followed when welding, including the welding sequence, joint design, and welding parameters.
- Welding personnel: The qualifications and certifications required for the welders.
- Inspection and testing: The inspection and testing procedures to be used to ensure that the weld meets the required quality standards.
- Repair and rework: The procedures to be followed if the weld does not meet the required quality standards and needs to be repaired or reworked.
It is important to follow the WPS carefully when performing Automatic welding without filler-metal additions to ensure that the weld is of sufficient quality and meets the required mechanical properties.
Welding of Pipelines and Related Facilities According to API 1104
References and Intranational Standard used in API 1104
DEFINITION OF TERMS USED IN API 1104
QUALIFICATION OF WELDING PROCEDURES FOR WELDS CONTAINING FILLER-METAL ADDITIVES
DESIGN AND PREPARATION OF A JOINT FOR PRODUCTION WELDING
INSPECTION AND TESTING OF PRODUCTION WELDS
ACCEPTANCE STANDARDS FOR NONDESTRUCTIVE TESTING
AUTOMATIC WELDING WITHOUT FILLER-METAL ADDITIONS