PT. XYZ is an international company operating in the energy sector, especially oil and gas, with a focus on fabrication and construction activities for large-scale projects. One of the main production processes that is very influential is welding. To ensure welding quality, PT. XYZ uses the Non-Destructive Testing – Ultrasonic Testing (NDT-UT) method. However, during the inspection process, problems are often found in the form of rejects due to defects that do not meet welding quality standards. Some types of defects detected include LOF (Lack of Fusion), LOP (Lack of Penetration), and ESI (Excessive Spatter Inclusion). This research aims to determine the percentage of the most dominant welding defects, identify factors that cause defects, and provide recommendations for improvements to improve welding quality. The method used is Statistical Quality Control (SQC) with the help of tools such as check sheets, histograms, Pareto diagrams, scatter diagrams, control charts and fishbone diagrams. Based on the data collected, a LOF defect of 5,434 mm was found, an ESI defect of 1,990 mm, and an LOP defect of 1,030 mm. SQC analysis shows that the dominant defect is LOF with a percentage of 64%. The main causal factors come from methods, humans, machines and materials. Therefore, companies need to make improvements and developments to reduce product defects so that they can improve welding quality.

PT The lathe is one of the essential machines in production activities in this company. The amount of downtime caused by machine failure will reduce product quality and quantity. Therefore, this research aims to identify the factors that most influence the risk of lathe failure so that repair priorities and maintenance strategies can be determined. This can be achieved by using the Failure Mode and Effect Analysis (FMEA) method. FMEA is a method that can be used to identify the causes and impacts of each possible failure mode on machine components by systematically explaining the levels of failure so that appropriate prevention or repair can be carried out. The FMEA method shows the Risk Priority Number (RPN) value as a reference in determining the choice of maintenance strategy, namely, predictive maintenance, preventive maintenance or corrective maintenance. The research results show that the highest RPN value is found in the motor shaft pulley component at 320 and Nut Screw at 210. Maintenance priorities are determined based on the Pareto diagram principle. The appropriate maintenance strategy carried out by PT.
 
Keywords: FMEA, Lathe, Maintenance, RPN

The faster economic development in the world causes tighter business competition. Plus the rapid progress of increasingly sophisticated technology. Many companies are currently competing to use technology to increase performance efficiency advantages in other companies and competition. Information technology that is quite popular in the current generation is System Application and Product In Data Processing (SAP). SAP is a system that runs a business using one database which can then be accessed by all departments in the company. This research aims to provide evaluation and input on the problems faced by SAP admin sales users at PT Bina Pertiwi Surabaya Branch. In this research, a qualitative approach was used by conducting interviews with resource persons from the administration department and Branch Administration Supervisors using a fishbone diagram. The results of the evaluation of the implementation of the admin job description for sales rental administration and units using SAP are quite good, but there are still problems caused by discrepancies between the actual cash in and the cash in plan, so AR monitoring must be carried out.