PSI - Issue 13

Luka Grubiša et al. / Procedia Structural Integrity 13 (2018) 430–437 Luka Grubiša, Darko Bajić, Tomaž Vuherer/ Structural Integrity Procedia 00 (2018) 000 – 000

432

3

TIG welding ATG welding Fig. 1. Schematic preview of the Marangoni effect of liquid metal flow in weld joint

Fig. 2. Application of an activating solder to a welded material face A-Plasma (on butt surface)

3. Material

Austenitic stainless steel 316L (ASME) or 1.4404 (EN) is non-magnetic. Due to the alloying element Cr, this material is corrosion-resistant. The material has very good welding characteristics, and it is weldable by all conventional processes. It is designed to operate at temperatures up to 400°C. Chemical composition of the base material is shown in Table 1 and its mechanical properties are represented in Table 2.

Table 1. Chemical composition of the base material

Share of elements, weight %

C

Cr

Mn

Mo

N

Ni

P

S

Si

Co

Cu

0.026

16.580

1.396

2.008

0.036

10.005

0.033

0.001

0.346

0.154

0.336

Table 2. Mechanical properties of the base material R p0,2 , MPa R m , MPa

A 5 , % 56.08

HRB

297.10

593.60

82

4. Experimental procedure

Welding was carried out using an A-plasma arc welding method, with usage of an activating BC31-solder according to the research Fekonja (2016). Welded joints are sheets of metal with following dimensions: 15 x 44 x 6 mm. The welding parameters are shown in Table 3. The welding is carried out with the equipment of the company “Alchrom Thies d.o.o. ”, Ruše, Slovenia. The appearance of the welded sample is presented in Fig. 3.

Table 3. Welding parameters I , A

U , V

v , cm/mmin

q , l/min

158

28.6

16

3.86

Fig. 3. The welded sample: weld surface (left) and root (right)