Lesson 10 - Reliability of Welding Filler Metals

© COPYRIGHT 2000 THE ESAB GROUP, INC. LESSON X 10.9.1 Chemical Composition Analysis Test - A weld pad for determining the chemi- cal composition of a filler metal must be prepared as shown in Figure 2. 10.9.1.1 The base metal size and material is specified, and the weld metal is built up in layers to the required height or number of passes to assure that the top surface has no dilution with the base metal. The welds are deposited in the flat position. After welding, the top surface is machined or ground smooth to remove all foreign matter. A sample is taken from this surface for chemical analysis by a suitable method agreed upon between the supplier and the purchaser. 10.9.2 Soundness (X-Ray) Test, All-Weld-Metal Tension Test and Impact Test - A test plate is prepared according to the specification with a sufficient number of passes to fill the groove, a sample of which is shown in Figure 3. 10.9.2.1 Some specifications require at least one stop and one start in the area of the weld that is to be radiographed (X-rayed). The specification may also call for the test plate to be preheated to a certain temperature before the first pass, and also specify an interpass temperature. This means that the test plate must be allowed to cool to a certain temperature range before the next pass is applied. 10.9.2.2 After the plate is completely welded, the test plate is prepared for radiographic examination by machining off the backing strip from the root (bottom) of the weld, and also TYPICAL WELDPAD FOR CHEMICAL COMPOSITION ANALYSIS Figure 2 CHEMICAL COMPOSITION SAMPLE TAKEN FROM THIS SURFACE SPECIFIED BY NUMBER OF LAYERS IN SOME SPECIFICATIONS

Lesson 1
The Basics of Arc Welding

Lesson 2
Common Electric
Arc Welding Processes

Lesson 3
Covered Electrodes for Welding
Mild Steels

Lesson 4
Covered Electrodes for Welding Low Alloy Steels

Lesson 5
Welding Filler Metals for Stainless Steels

Lesson 6
Carbon & Low Alloy
Steel Filler Metals -
GMAW,GTAW,SAW

Lesson 7
Flux Cored Arc Electrodes Carbon Low Alloy Steels

Lesson 8
Hardsurfacing Electrodes

Lesson 9
Estimating & Comparing Weld Metal Costs

Lesson 10
Reliability of Welding Filler Metals

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