P PT. Bonne Indo Teknik is a company that moved in manufacturing industry on oil and gas area. The product which this company produced is pipe line. The product is made from steel material. The pipe line that often be ordered by consumer needs a good quality. The objective of this research is to decrease the amount of flawed product from the failure of production process at PT. Bonne Indo Teknik. Based on the data that has been gathered, the highest level of flaw is on the process of SMAW welding. Non Destructive Test method is the method that is used to identify the kind of flaw that occurred on the welding process. With this method, we could identify the kind of flaw that occurred, and also the amount and the size of flaw, so we could know what step that should been done after knowing the occurred flaws. The result is showing that there is 32,5% percent porosity flaws that occurred on the process of SMAW welding. Failure Mode and Effect Analysis method is the method that is used to identify the cause, the consequence, and the solution upon the problems that occurred at production process. The three factors that be treated on Failure Mode and Effect Analysis are severity, occurrence, and detection. These three factors afterwards be tabulated on analysis and used to be the input on the quantification of Risk Priority Number (RPN). Risk Priority Number is gotten from the multiplication of those three factors. The main factor from the occurrence of porosity flaw on the process of SMAW welding is because of the present of wind bellows that offend the welding process so it is cause the occurrence of porosity flaw on the surface of welding product. Therefore, the suggestion submitted is to use a assisting tool to reduce the wind bellows that occurred on the process of SMAW welding.