definition of fusion weld
What is weld penetration: the depth of fusion of the base metal or front bead weld on the cross section of the welded joint .
Welded joints include: weld (0A), fusion zone (AB), and heat affected zone (BC).
Step 1: Sampling
1) Welding penetration sample cutting position:
span1
b, cut at 1/3 of the weld scar
cut at the middle position of the weld scar, c, weld scar .
2) Cut
a. Turn on the power,After checking whether each measuring equipment meets the test requirements; as shown in Figure 1, open the protective casing of the metallographic cutting machine and install the metal sample block to be tested. (Note: Be sure to fix the metal block completely! )
b, as shown in Figure 2, close the metallographic cutting machine protective case, open the water valve, turn on the power switch; hold the gold With the handle of the cutting machine, press down slowly and lightly to cut the metal sample block. After cutting, the length, width and height of the metal sample block should be less than 4mm; close the water valve, turn off the power supply, and take out the metal sample block.
Step: sample preparation
1, 4, metallographic polishing to open the hood, mounted waterproof sandpaper ; Turn on the power switch, clamp the sample block with clamps, and grind the cutting test surface; when grinding. First, sand with No. 1 sandpaper until the end of the sample block is flat; then use No. 2 sandpaper until it is flat, and the scratches generated in the previous process are removed.
Step 3: Corrosion
span1Prepare a corrosion solution (3-5% nitric acid, alcohol) with anhydrous alcohol and nitric acid in a measuring cup. Put the metal sample into the corrosion solution or use a small brush to wash the cut surface for corrosion. The corrosion time is about 10 -15 seconds, the specific corrosion effect needs to be checked visually.
2. As shown in Figure 6, take out the metal sample block with tweezers after the corrosion is completed (note: do not touch the corrosion liquid by hand), and clean the corrosion solution on the surface of the metal sample block with clean water.
3, dried
Step Four: weld penetration inspection method
step 5: save weld penetration inspection reports and samples
1) of the weld penetration Inspection report:
a, attached to the cross-sectional diagram of the inspection site
b, the sketch to mark the welding penetration measurement position 1 _p15 spanspan1 spanspan _p5 Data attachment
2) Welding penetration sample preservation rules:
spa n1span a. Parts related to frame S are kept for 13 years
b. General parts are kept for 3 years
c. If the drawings are otherwise specified, it will be implemented according to the drawing requirements
(The penetration inspection surface can be attached with transparent adhesive to delay rusting)
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