Knowledge about welding rods 1

What is welding current? Answer: The current flowing through the welding circuit during welding, generally expressed in amperes (A).

What is arc voltage? Answer: The voltage drop between the two ends of the arc (the two electrodes), generally expressed in volts (V).

What is welding speed? Answer: The length of the weld completed per unit time, generally expressed in centimeters per minute (cm/min).

What is weld length? Answer: The distance between the end of the welding wire and the end of the contact tip during welding.

What is welding energy input? Answer: The energy input per unit length of the weld from the welding heat source during fusion welding, also known as "heat input." It is generally expressed in joules per centimeter (Jcm).

What is weld metal fusion ratio? Answer: The proportion of the melted base metal in the weld metal during fusion welding.

What is weld shape factor? Answer: The ratio of weld width to weld thickness in a single weld cross-section during fusion welding.

What is left-hand welding? Answer: During fusion welding, the welding torch moves from the right end of the weld to the left end. This method provides effective gas shielding and creates a beautiful weld. CO2 and TIG welding both use left-hand welding; MIG welding of aluminum must use left-hand welding.

What is right-hand welding? Answer: During fusion welding, the welding torch moves from the left end of the weld to the right end.

Why are welded joints considered the weakest link in welded structures? Answer: Because welded joints have uneven microstructures and properties, often contain welding defects, and exhibit high tensile residual stresses, welded joints are considered the weakest link in welded structures.

Why is it said that high-quality welded joints can be obtained through process approaches? Answer: To improve the quality of welded joints, we can start from the following approaches: correctly select welding materials, adopt reasonable welding process methods, control fusion ratio, adjust welding thermal cycle characteristics, use reasonable operating methods and groove design, supplemented by preheating, interlayer insulation and slow cooling, post-heating and other measures, or post-weld heat treatment methods, etc., to obtain high-quality welded joints.